Blurred Edges: objects are perceived as blurred or fuzzy as they move quickly before the eye. If you were to watch a speed cyclist pass before you, the cyclist’s body and bicycle (especially the spokes of its wheels), would be in a constant blur.


In Giacomo Balla’s Dynamism of a Dog on a Leash, 1912, both the woman and dog are traveling so quickly past us that they are perceived as a blur of legs, tails, fabric, and multiple leashes. The more blurred their outlines, the faster they appear to be traveling. Even the surface of the pavement (diagonals suggest action) is blurred.