Learn how to draw a hole in your paper with falling and floating 3D cubes. This short video from Circle Line Art School shares how to easily create the anamorphic drawing illusion with a pencil and a marker.
Next: How to draw a floating / levitating cube, How To Draw Your Hand In 3D, and how to draw a Penrose Rectangle & other impossible objects.
Improve the technique with this more complex optical illusion tutorial: A world of 3D cubes seen through a ripped hole in the graph paper. Shading with grey markers takes this DIY illusion to the next level.