The Penrose triangle (here dcorated with playing dices) is a very traditional form of optical illusion which seemed very difficult to reproduce in real life and in 3D.
Up to we’ve seen these two impressive realisations:
We have to admit that we all thought it was only an optical illusion up to this video demonstration.
Or should we follow the counter-explanation showing that this is a simple perspective trick:
M.C.Escher paintings and engravings are playing havoc with perspective and the way our senses and brain build and internal image of what is visible. I would not believe it possible to reproduce them with such a rigid structure as the one provided by Lego bricks.
Andrew Lipson is not the guy to be stopped by mere impossibility. He started with a simple deformation:
After this little play, he went to much more serious work, one engraving that is not possible in the real world. A few inconsistencies, but a good copy of one of the most famous M.C.Escher paintings:
My preference goes to Relativity (and what it reminds me of the movie “The name of the rose“, with Sean Connery):
Then, a completely warped perspective made out of these little LEGO bricks:
Interestingly, one of the simplest optical illusion has been built in various sizes allowing to see it out of a book or your computers screen. Real life sculptures, I mean. Francis Tabary made most of these.