The black serves as the control. The circles are a basis for comparison.
The corners of the negative shape illustrate the concept of modification.
Same form and same size, situated directly on top of one another.
OVERLAPPING + SUBTRACTION
Varying speeds of subtraction/various overlapping possibilities.
Objects appear uncoordinated at first. Bottom moves left and right. Top box either coordinates itself directly next to the bottom box of rests on top of it, depending on the position of the bottom box. The animation returns to its un-coordinated state.