Being Autistic you can sometimes be locked in your own little world, even though you sometimes cannot communicate verbally, it doesn't mean you cannot communicate in other ways from makaton (of which I know nothing myself, to usual visual pictures with simple words on.
The simplest thing that I have found that brings me joy to unlocking the silent world that lies within an autistic is a tray with sand in it and a paint brush. Who knew that such simple items could break such pleasure.
Many children are unable to vocalize their emotional state because of their autism or if they are on the autistic spectrum . Incorporating the element of a familiar medium, the sand, allows a child to instantly achieve a sense of comfort and security. With little instruction from the teacher or a teaching assistant like myself , the child is free to play and develop his or her own expression of situations. Oftentimes the children will experience a sense of independent play and will begin making assumptions and behavior changes without cues from the teacher or teaching assistant. This method therapy serves as a valuable and powerful outlet for children and an incredibly insightful method of opening access to their world.
The way that I used it was that i said the sound and the child with a paintbrush drew the letter in the sand. Amazing with phonics going off all around us this served as reinforcement for the activity we were doing. A calming and pleasant activity, you will often find they will do letters that you never thought that they knew.