Penrose triangle
Oscar Reutersvärd; independently Lionel & Roger Penrose
Three convincing corners. One impossible connection.
Impossible objects / 2007 drawing
Impossible octagon
Eight sides make a deceptively convincing impossible loop.
TRY THIS
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
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Download imageFrequently asked questions
What is Impossible octagon?
Eight sides make a deceptively convincing impossible loop.
What should I look for in Impossible octagon?
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
What explains Impossible octagon?
Follow the face of one beam around the octagon. The repeated corners encourage a regular solid reading while combining incompatible depth cues.
Another way to see it
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Impossible cube
M. C. Escher; modern redraw by 4C and Belbury
A familiar cube frame acquires an impossible set of overlaps.
