Impossible perspective
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.
Fake swimming pool
Don’t fall for this swimming pool, don’t fall into this swimming pool.
YouTube link
This is an art installation where you may think that there is a swimming pool, but only the surface of the water is present as a glass roof on top of an empty swimming pool.
Source: 21st Century Museum of Art of Kanazawa by Leandro Erlich.
Dolphins message of love
How many blocks?
Look at the following picture and count the blocks that are drawn there. Will you find more than 2 of them?