Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An
optical illusion depicting an impossible solid object made of three straightbeams of squarecross section which meetpairwise atright angles at thevertices of thetriangle they form.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
After Roger Penrose (1931-), English mathematician, who popularised it in the 1950s.
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Examples
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