R most favourite manipulative medium is pom poms, but is very closely followed by dried beans. I made a mini-sensory tub for him with a couple of aims. Firstly, I gave R a choice of items to hide in the beans...he chose the rockets that we used in our outer space unit. Secondly, I wanted to give R a small container for him to practice keeping the beans in the container. Thridly, he loves playing with the dried beans!