p298fig08.11 This formotion percept is a double illusion due to boundary completion in the form stream followed by long-range apparent motion using the completed bioundaries in the motion stream.<BR>||  Form-motion interactions. Apparent motion of illusory contours (Ramachandran 1985).  Double illusion!  Illusory contour is created in form stream V1-V2.  Apparent motion of illusory contours occurs in motion stream due to a V2-MT interaction.