Prashobh Nair posted this intriguing photo of "A stone pillar at Vazhappally Maha Siva Temple, Kerela which is attributed to the legendary craftsman Perumthachan. Its four sides are identical, and now unknown how the two parts were joined."
Looks impossible to make, doesn't it? Turns out this is a well-known trick - check out the solution on Quora here when you're ready for the answer.
