Twisted Square Optical Illusion

This artwork is by Victory Vasarely.

In this optical illusion, it looks as though the square is twisting. The square is also getting smaller towards the center of the image which creates the illusion of the center receding away from the viewer.

But it's actually quite easy to recreate - it's all down to the use of the lines!

You'll need white paper, a pencil, a black marker and a ruler for this illusion.