Click and drag the circles.
In Twins 03 the un-clicked circle has noise introduced into the mapping between the mouse and its position resulting in a wiggling when dragging. At various times, its direction of movement will be either complementary, opposed, or tangental to the direction of input movement and also to varying degrees. The result appears as an ambiguous causal relationship where the tightly mapped dot affects the wiggly one. However, at times it appears as if the dragged dot should be responding to the wiggly one, creating slight tension when the dragged dot doesn’t conform to expectations established by the visual relationship.