Penrose triangle
Oscar Reutersvärd; independently Lionel & Roger Penrose
Three convincing corners. One impossible connection.
Impossible objects / 2011 drawing
Impossible trefoil knot
A three-crossing knot becomes an impossible solid ribbon.
TRY THIS
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
THE IMAGE IN THIS ARCHIVE
AnonMoos
Original file & attribution · Public domain
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What is Impossible trefoil knot?
A three-crossing knot becomes an impossible solid ribbon.
What should I look for in Impossible trefoil knot?
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
What explains Impossible trefoil knot?
The trefoil itself is a perfectly possible mathematical knot. Here its solid faces are arranged as an impossible figure: the shading and connections cannot all describe the depicted rigid object.
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.
