Also on these boards
A company called Blandito has designed a circular, foldable pillow that can be manipulated into many shapes (bed, chair, cubbies of different kinds.) Extra larges for adults as well as children's size. I can see this being great biofeedback for sensory averse/craving children. Too bad it's still in the design phase!
Ink chromatography - a detective might use this if someone illegally changed the dollar amount written on a check or wrote a ransom note. You will need two different pens. Use two paper towels or coffee filter strips about 1-inch wide. Draw a dot on each paper with the pens. Make note of which pen you used for each paper. Place the paper in a cup of water with the dot just above the water line. As the water soaks up through the paper, you will see a distinctive pattern for each pen.
Pilot Frixion - Wicked Awesome Erasable pens that flow nicely like you would expect, but erase COMPLETELY!