If it fits… Source/credit: 花憐 What am I looking at? This physical optical illusion is caused by a reflection. The cat is sitting on the left side of the glass door, while the box is placed on the right side of the door. The reflection perfectly places the cat in the box. More optical illusions:Footprint in the sandNext to the boatSkydiving CorgiGod of all CatsInappropriately DressedFirefallDelivery carImpaled windshield