Deborah R. Fowler
Cube Illusions
Posted Jan 3 2021Updated Jan 20 2022
While playing with puzzle cubes, I also used the cubes to create two classic illusions:
The classic one is name Necker Cube illusion. It was first published as a Rhomboid in 1832 by Swiss crystallographer Louis Albert Necker as stated in https://mathworld.wolfram.com/NeckerCube.html
Also on youtube at https://www.youtube.com/watch?v=A_HCngd7XNs
Another example, which I like to call Illusion+ as it looks like a plus sign, is described at https://optical-illusions.fandom.com/wiki/Isometric_Illusion
Isometric illusions are also called ambiguous figure or inside/outside illusion.
Also on youtube at https://www.youtube.com/watch?v=t9DMFiHnjcs