have you ever seen those 3D sidewalk chalk pictures where it looks like you can fall into the sidewalk or like something's reaching out towards you? when i was wandering around in korea we came upon a museum full of art like that. it was pretty clever and so fun to interact with.
this one cracked me up
this is one of my favorite pieces. from a distance it looks like thick layers of acrylic paint but it's actually stacks of painted paper.