Playdough mats booklet (entire booklet printable!)
Draw the outline of a hand, very lightly in pencil, and then began drawing lines freehand across the paper. When part of the hand is in the way of the straight line, have each artist "crawl over" their finger or hand with curves and arcs. The optical illusion becomes very obvious if the lines were close together and the curves fairly strong.
pipe cleaners cut short with a number taped to the end. Have the kids feed the same number of pony beads onto the pipe cleaners.
Free download - Ten Tips for Classroom Management
Ivory soap in the microwave experiment