Convex Door Illusion
Look at the picture above. Is it a flat door? Yes it is a flat door. The artist paint the door to make it looks bulged, convex or concave.
Source: Bulged Doors Illusion via Door Illusion
Look at the picture above. Is it a flat door? Yes it is a flat door. The artist paint the door to make it looks bulged, convex or concave.
Source: Bulged Doors Illusion via Door Illusion