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| | John Robinson - Firmament |
 | | He asked me if I thought it would be possible to use his findings in a sculpture, and explained that the radii of the spheres are, if the unit is a decimetre, 1.5cm, 2.8cm, 5.3cm, 10cm, 18.8cm, 35.5cm, 66.8cm. |
 | | Donald Coxeter's 90th birthday was on February 9, 1997, and FIRMAMENT was given to him as a birthday present from John Robinson by Ronnie Brown at the Fields Institute. |
 | | This material may be used freely for educational, artistic and scientific purposes, but may not be used for commercial purposes, for profit or in texts without the permission of the publishers. |
| www.popmath.org.uk /sculpture/pages/5firm.html (473 words) |
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