# \#mirrors

**URL:** https://scanalyst.fourmilab.ch/tag/mirrors/1949.md

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## [Building a Kite-Rhombus Hectapentacontahedron — Chiral Mirror Ball](https://scanalyst.fourmilab.ch/t/building-a-kite-rhombus-hectapentacontahedron-chiral-mirror-ball/3645)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [23 August 2023 11:36 UTC](https://scanalyst.fourmilab.ch/t/building-a-kite-rhombus-hectapentacontahedron-chiral-mirror-ball/3645 "2023-08-23T11:36:06Z")

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What’s better than a mirror ball constructed from dual polyhedra? How about a pair of chiral 3-polytopes that are mirror images of one another!

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## [Engage Cloaking Device! — It's Done with Mirrors](https://scanalyst.fourmilab.ch/t/engage-cloaking-device-its-done-with-mirrors/3633)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 1\
**Last updated:** [20 August 2023 17:10 UTC](https://scanalyst.fourmilab.ch/t/engage-cloaking-device-its-done-with-mirrors/3633 "2023-08-20T17:10:42Z")

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This is similar to “The Mystery of the Floating Head” in Herrmann’s Book of Magic (full text), originally published in 1903 and in a Web edition at Fourmilab in July, 2006. This trick adds two mirrors to r…

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## [Through the Looking Glass—How Do Mirrors “See” Hidden Objects?](https://scanalyst.fourmilab.ch/t/through-the-looking-glass-how-do-mirrors-see-hidden-objects/3075)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [21 April 2023 14:47 UTC](https://scanalyst.fourmilab.ch/t/through-the-looking-glass-how-do-mirrors-see-hidden-objects/3075 "2023-04-21T14:47:16Z")

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If you look at it as a ray tracing problem from the eye to the object via the mirror, it’s actually pretty straightforward.

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## [Building an Unilluminable Room](https://scanalyst.fourmilab.ch/t/building-an-unilluminable-room/1370)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [15 May 2022 12:33 UTC](https://scanalyst.fourmilab.ch/t/building-an-unilluminable-room/1370 "2022-05-15T12:33:01Z")

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Is it possible to design a room entirely lined with mirrors which cannot be completely illuminated by a point light source placed at any position? This is the “illumination problem”, posed by Ernst Straus …