This optical illusion features a series of vertical lines that appear to be tilted at an angle. The illusion is created by the use of alternating black and white lines that are slightly offset from each other. The illusion is enhanced by the use of shading and highlights to create a 3D effect. This
From Wikipedia
The Orbison illusion is an optical illusion first described by American psychologist William Orbison (1912–1952) in 1939.