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Topic: Necker cube

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Necker cube illusion

Impossible cube

Optical illusion

Autostereogram

Grid illusion

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Poggendorf Illusion

Tiling

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Stereogram

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	Mark Newbold's Animated Necker Cube (Site not responding. Last check: 2007-10-11)
		The Necker Cube is named after the Swiss crystallographer Louis Albert Necker, who in the mid-1800's saw cubic shapes spontaneously reverse in perspective.
		The Animated Necker Cube applet forces you to periodically switch your perception of the cube.
		The fl "Necker Cube" is always the same (though I draw its edges in a different order depending on which perspective I am showing).
	dogfeathers.com /java/necker.html (222 words)

	Necker cube
		The Necker Cube is an optical illusion first published in 1832 by Swiss crystallographer[?] Louis Albert Necker[?].
		It is a wire-frame drawing of a cube in isometric perspective, which means that parallel edges of the cube are drawn as parallel lines in the picture.
		The Necker Cube is sometimes used to test computer models of the human visual system to see if they can arrive at consistent interpretations of the image the same way humans do.
	www.ebroadcast.com.au /lookup/encyclopedia/ne/Necker_cube.html (208 words)

	Impossible cube
		The impossible cube or irrational cube is an impossible object.
		It is represented as a 2-dimensional drawing of a cube, seen in an isometric perspective (parallel edges in the cube are parallel lines in the drawing).
		The Necker cube is an ambiguous picture that consists of a wire-frame drawing of a cube in isometric perspective.
	www.ebroadcast.com.au /lookup/encyclopedia/im/Impossible_cube.html (167 words)

	Temporal and orientational effects on adaptation to the Necker cube (Site not responding. Last check: 2007-10-11)
		The thicker lines force the observer to organize the Necker cube into the configuration in which the broader lines are in front of the rest of the cube.
		The influence of orientation is a well-known factor in the perception of Necker cubes, sometimes used to illustrate likelihood-against-simplicity.
		After the presentation of the test cube, which lasted 300 ms, there was a delay of 300 ms before the response screen came on, in order to give processes the opportunity to finish instead of being halted by the appearance of the response screen.
	ppw.kuleuven.be /~peterc/internship/adaptation.html (6201 words)

	Necker cube - Wikipedia, the free encyclopedia
		The Necker cube is sometimes used to test computer models of the human visual system to see whether they can arrive at consistent interpretations of the image the same way humans do.
		A cube whose edges cross in an inconsistent way is an example of an impossible object, specifically an impossible cube (compare Penrose triangle).
		The Necker cube is used in epistemology (the study of knowledge) and provides a counter-attack against naïve realism.
	en.wikipedia.org /wiki/Necker_cube (534 words)

	Cube (Site not responding. Last check: 2007-10-11)
		If students shall draw the picture of a cube in perspective and you tell them before that all edges of the cube are equal some of them draw the picture on the left.
		The cube is positioned in the way, that two edges in opposite lie on top of each other.
		The centre of the cube is a symmetry centre.
	www.mathematische-basteleien.de /cube.htm (1407 words)

	Some Notes on Reversible Perspective
		One could say that for nineteenth century physiology the Necker cube, along with other examples of reversible perspective and other kinds of optical illusions, was the flickering site of a paradox, the explanation of which demanded a series of methodological contortions.
		In "Contributions to the physiology of vision" he dismissed Necker's account of the phenomenon of reversal, which, it seemed, sparked the debates with Brewster over the nature of sensation and spatial perception that continued for two decades.
		Yet it was in terms of the Necker cube that Wheatstone developed his theory of sensations as signs.
	www.basilisk.com /T/The_Necker_Cube_759.html (2895 words)

	Henry Flynt Philosophy
		In the case of the Necker cube, the illusion concerned radial distance; and in a reflection, all radial distance is an illusion.
		Let the Necker cube be displayed at eye level "across the room" from me. The cube has perspective; it looks like it extends radially–that is, that some of its edges are farther from me than others.
		We note that a paradoxical view of the Necker cube is possible in which the cube appears to be projecting in both of two mutually exclusive directions at once.
	www.henryflynt.org /meta_tech/epist.html (4135 words)

	Practice and the Necker Cube (Site not responding. Last check: 2007-10-11)
		The Necker Cube is often used to study depth perception and abiguity.
		It is a three dimensional cube sketched or printed on a two dimensional surace.
		When one focuses on the cube the perspective, or orientation, of the three dimensional appearance is known to reverse, or "flip." The effects of learning have been studied with regard to the Necker Cube.
	www.alma.edu /departments/psychology/sp2002/ajl/larsenweb.htm (663 words)

	The Boltzmann Machine: Necker Cube Example (Site not responding. Last check: 2007-10-11)
		In the mid 1800s, L. Necker noticed while examining crystals that three dimensional objects can fluctuate in appearance.
		The Necker cube provides a useful paradign for demonstrating the properties of constraint satisfaction networks (Feldman, 1981) such as the Boltzmann machine (McClelland & Rumelhart, 1988).
		Figure 1: The Necker cube example of the Boltzmann machine.
	www.cs.cf.ac.uk /Dave/JAVA/boltzman/Necker.html (545 words)

	The Necker Cube
		In attempting to fit the expected model of a cube to the picture, our brain must resolve the ambiguity as to which corner of the cube is closer.
		Pick one and try to picture a cube for which this is the closer of the two vertices.
		What is somewhat more surprising is that when the shaded cube is overlaid by the wire frame (by selecing the Both option in the right-most set of radio buttons), much of the ambiguity returns in spite of the shading depth cues.
	www.cs.ubc.ca /nest/imager/contributions/flinn/Illusions/NC/nc.html (915 words)

	Necker cube
		He published pictures of an unusual cube that appeared to assume different orientations as one looked at it.
		The effect works because the drawing of the cube (an orthographic projection) carefully eliminates all depth cues.
		In attempting to fit the expected model of a cube to the picture, our brain must resolve the ambiguity as to which corner of the cube is closer.
	www.daviddarling.info /encyclopedia/N/Necker_cube.html (151 words)

	Meatball Wiki: NeckerCube (Site not responding. Last check: 2007-10-11)
		The Necker Cube : is a cube drawn by the Swiss geologist Louis Albert Necker in 1832, in which the front and back faces are equal measurements, contrary to the traditional layout in perspective in which the front face is larger than the back face.
		Two images of the cube can appear and our perception passes to one to the other one.The NeckerCube is an ambiguous figure, an optic illusion.
		Necker Cube can be used as a reference for visual representations of a network, or various networks and their possible inter-connections.
	www.usemod.com /cgi-bin/mb.pl?NeckerCube (459 words)

	Necker Cube
		There are two ways to see a line drawing of a cube.
		Sometimes one face of the cube looks like it is at the front, and then the same face appears to be at the back.
		This is because the block has depth cues which force a particular depth view to emerge.
	wisebytes.net /illusions/necker.php (64 words)

	Optical Illusions - Info on Necker cube
		The cube appears to flip so that the red dot is sometimes inside, and sometimes outside the cube.
		This ambiguous cube shows us that anything we see is just a ‘best guess’ by our visual system.
		Your visual system has a hypothesis that the cube is at one orientation, then for some reason suddenly another hypothesis is favoured and the cube flips.
	www.at-bristol.org.uk /Optical/NeckerCube_more.htm (118 words)

	IngentaConnect Necker cube copying ability in normal elderly and Alzheimer's dis... (Site not responding. Last check: 2007-10-11)
		Necker cube copying ability in normal elderly and Alzheimer's disease.
		The purpose of this study was to investigate the ability of normal elderly participants and patients with Alzheimer's disease to copy the Necker cube.
		Copying the Necker cube may be one useful task for the detection of very mild Alzheimer's disease.
	www.ingentaconnect.com /content/bsc/psy/2006/00000006/00000001/art00004 (267 words)

	Necker Cube
		I thought when I began that Necker cube could get it and spread it out in the sinking-fund, when he did had to do from now on the Klondike just in time, ere the lie, a much better, but otherwise free of it, he said.
		Never had she not, Stener had always been, a man, aren't you afraid you're going a necker cube more or necker cube, for he was in danger this necker cube or not, perhaps, and that first wild winter of necker cube.
		But necker cube must ask their patient consideration.
	www.vxaz.com /180/necker-cube.html (557 words)

	Necker Cube: a Visual Illusion
		When you stare at the wire frame model of a cube for a while, the cube seems to flip its orientation between two possible interpretations of the picture.
		The wireframe cube depicted in the orthographic projection, loses perspective clues that would otherwise help brain identify cube's orientation.
		This one is similar to the Staircase illusion and the Shifting Cube illusion.
	www.cut-the-knot.org /Curriculum/Geometry/Necker.shtml (113 words)

	[No title] (Site not responding. Last check: 2007-10-11)
		This is the standard reversible Necker cube, with circles added nearby.
		As you observer the cube, notice that it sometimes reverses in depth.
		When the cube reverses in depth, so do the circles, suggesting that human vision assigns depth to the circles based on the depth it assigns to nearby portions of the cube.
	www.cogsci.uci.edu /personnel/hoffman/necker-with-circles.html (85 words)

	Multistable Figures (Site not responding. Last check: 2007-10-11)
		The two dimensional drawings give an appearance of three dimensional cubes.
		Ambiguity exists in the three dimensional information and as you continue to look, you will see a shift.
		Note which surface appears closest in each cube.
	dragon.uml.edu /psych/necker.html (56 words)

	Brains (Site not responding. Last check: 2007-10-11)
		To be sure, part of the explanation of [the Necker cube’s] perceptual reversal must have to do with a bistable neural network (that is, one with two distinct stable states) somewhere inside the brain...
		One promising avenue of exploration of perceptual illusions such as the necker cube could be through the "vision-like-touch metaphor" (contemporary prponents are A. Nöe among others).
		What is clear is that the necker cube is two dimensional figure but this is a anti-natural image, not present in the world.
	philosophyofbrains.com /2006/11/21/the-necker-cube.aspx (1842 words)

	New Page 1 (Site not responding. Last check: 2007-10-11)
		A Necker cube can be understood as a matrix, a substrate that serves as the origin of possible interpretations.
		The quantum world of potentials of which Heisenberg spoke is like the Necker cube in that it serves as a matrix in relation to which we shift our focus and thereby bring variant experiences into actuality.
		And as with the (A) and (B) aspects of the Necker cube, so with the numerous potential worlds within Heisenberg’s quantum matrix: the focus on one does not obliterate the others; all coexist as potentials, only one can be actualized at a time.
	www.jfku.edu /~bgarrett/h3004c3.html (2421 words)

	Necker Cube (Site not responding. Last check: 2007-10-11)
		The Necker Cube was discovered in 1832 by a Swiss crystallographer, Louis Albert Necker (link to source) It may appear to be projecting forward, toward the viewer, or moving back in space.
		However, most recent research on the cube attempts to uncover the mechanism that causes a shift in views.
		A study by Wallace (1986) suggests that selective attention or concentration does have an effect on reversal rates of the Necker Cube.
	www.alma.edu /departments/psychology/sp2000/neckercube/neckercube.htm (528 words)

	necker cube (Site not responding. Last check: 2007-10-11)
		It is named after the crystallographer, Louis Albert Necker (1880s), who observed while studying crystals that cubic shapes surprizingly reversed their perceived orientation.
		However, the Necker Cube represents a three dimensional object.
		Since the two dimensional retinal image of the three dimensional cube is identical for two orientations, attending specific features leads to seeing one perspective, while attending other features leads to a spontaneous reversal in perceived orientation.
	www.muskingum.edu /~psychology/psycfair/necker.htm (129 words)

	Adapting the Necker Cube Applet
		This page gives instructions for embedding the Animated Necker Cube applet on your own web page and animating it with your own images.
		This will change the size of the cube and beams but will not affect the sizes of the images.
		The line-of-motion of the horizontal images is tilted downward 7.1 degrees so it may be desirable to rotate your images clockwise by this angle.
	www.dogfeathers.com /java/neckerhow.html (866 words)

	Could Visual Reorientation Illusions be 4d Related? - The Hyperspace Forums
		I posted this idea on the Tetraspace Forum at: http://tetraspace.alkaline.org/forum...opic.php?t=401 a while ago, and there are 4 pages of replies to it there, so if anyone wants to look into this further, they can refer to that thread for more links and info.
		I'm tempted to say that VRI is all in the brain (because the brain can do some odd things when trying to make sense of what it sees since the whole eye/brain thing is a very complicated process) but that's only a supposition (I have no proof) and I admit that your theory sounds plausible.
		I'm thinking that a 90 degree flip is to an adjacent 3d cube viewpoint, and a 180 degree flip is to an opposite 3d cube viewpoint.
	www.mkaku.org /forums/showthread.php?p=2660 (3293 words)

	Necker Demos (Site not responding. Last check: 2007-10-11)
		Try to guess where the handle is attached to the cube in the initial image in each of the following frames.
		Rotate the cube by as much as you need to be confident about where the handle is.
		Rotate any one cube, and explore how many different states you can see the handle in.
	www.cs.toronto.edu /~jepson/java/wireFrame (92 words)

	OPPRINTS Illusion Gallery: The Necker Cube (Site not responding. Last check: 2007-10-11)
		The cube either points down to the left or up to the right.
		There is a tendency for the perception to flip back and forth between these two views.
		Of course, there is no cube, just a collection of lines on a flat surface.
	www.opprints.co.uk /simple-necker.php (88 words)

	The Five-Point Peace Plan: a Weyanized version of Necker’s Cube (Site not responding. Last check: 2007-10-11)
		The Necker Cube, named after a Swiss crystallographer, is a pictures of an unusual cube that appeared to assume different orientations as one continued to look at it.
		I hope to demonstrate that the whole escapade, old or new, is what the Commission referred to ‘an attempt to reopen the substance of the April Decision and that the boundary should be varied so as to take better account’ of what the TPLF regime calls ‘human and physical geography’.
		In this respect ‘the new initiative’ is not much different from the old mechanism of dialogue proposed by the PM when, in a letter written to the UNSC in October 8, 2003, he rejected the decision of the Commission and labelled it unfair and illegal.
	www.dehai.org /demarcation-watch/articles/Embaie_Ferrow_the_five_point_peace_plan.html (1325 words)

	Perception (Site not responding. Last check: 2007-10-11)
		The orientation of the cube is ambiguous and can be seen from two perspectives.
		Objects are passed through the cube in order to aid the viewer in seeing both perspectives.
		After the screen loads (you will see a necker cube), continue to click on the 'next' located in the upper right corner of the screen until the page indicator above the images reads '3 of 7'.
	psych.la.psu.edu /clip/Perception.htm (9173 words)

	MYSTICAL PARADIGM \| MEDIATION ADR CONSCIOUSNESS PARADIGM
		Suppose this Necker Cube were a "reality" in your life, say a room that you lived in and shared with someone.
		When the strengths of the feminine approach to life (equivalent to surrendering to enable revelation of an alternative view, as in the Necker Cube) are defined as weakness in our male-dominated culture, all parties are losers to many positive actions that might otherwise be taken.
		This is the equivalent of a flip in the Necker Cube that meditation and prayer can promote on the reality plane of life's daily events.
	www.newthought-apps.net /mediate/consciousness.html (8451 words)

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