1) When you just wake up, possibly stare at the wall or the room, and things in your visual field don’t come together. Sort of waking up into a warped space, like M.C. Escher’s drawings. A few seconds later, your 3D, put-everything-together sense kicks in and you realize that you’re looking at the wall, and the strange, floating rectangular pit is not a pit but the door’s opening.

2) This could happen when you sneeze? You see transparent confetti falling. It’s sparkly transparent and with rainbow colors, wiggling down like worms. A few seconds later everything returns to normal.

Topics: psychology, eye, vision, physiology, perception, Cognition