So I found this cool sensory activity on another blog. It is super easy to do. You get a gallon sized ziploc baggie and some paints. You squirt the paint into the bag and seal it up. Then you tape it to your sliding glass door! Simple as that! Little one and I practiced his shapes and letters. Its like using a dry erase board without any cleaning :). Little one kept looking at his hands to see if there was any paint on them ;). Try it out!