Answer:
An optical illusion is a way of art. Optical illusions give motion even though the art is not moving. I would make a bunch of waves then perfect shading to highlight the motion of the waves. HOPE THIS WILL WORK.
a chili-dog :D
(I love wholesome jokes like this, have a wonderful day ^^)
I think that the answer is coins.
B. 1 I know because I play the flute