Pictures are dropped along the pointer and thrown away by gravity. One appears every so many pixels of travel rather than on every pointer event, so a slow drag and a fast flick leave the same trail instead of one leaving a hundred pictures and the other three.

Every picture is thrown upward and falls, using Physics2DPlugin – velocity, angle and gravity rather than a scripted path, so no two land the same way. No more than 24 are ever in flight at once.