If I fits I sits: A citizen science investigation into illusory contour susceptibility in domestic cats (Felis silvestri...

A well-known phenomenon to cat owners is the tendency of their cats to sit in enclosed spaces such as boxes, laundry baskets, and even shape outlines taped on the floor. This investigative study asks whether domestic cats (Felis silvestris catus) are also susceptible to sitting in enclosures that are illusory in nature, utilizing cats' attraction to box-like spaces to assess their perception of the Kanizsa square visual illusion. 

https://www.sciencedirect.com/science/article/abs/pii/S0168159121001258