Working with art materials focuses your vision on the space of the page or from the eye to the hands. The surrounding colours, shapes and movement shifts out of focus and to a certain extent sounds also retreat. I think this is partly why art activities are often so relaxing for people on the autism spectrum. It engages them in the moment in things within the immediate surroundings. When clients are absorbed in the art process they often stop making repeated sounds or movements which function to block out overwhelming input.