Easels are a great piece of equipment for people on the autistic spectrum. They help focus attention and block out surrounding visuals therefore reducing excess stimulus that contributes towards sensory overload. Large easels for painting and drawing encourage a wider range of movement which involves more physical exertion and therefore helps calm. Painting and drawing at an easel can also encourage a greater range of movement from repetitive movements. 
You can also get table easels which can hold books. Go to an art shop or shop on line.