I do this thing where I put something over my head (usually dirty clothes from the hamper, unfortunately) and walk around the room. I can find my way amazingly well around without using my sight. Occasionally, I hold my arms out for balance or peek out to confirm I am headed in the "right" direction. When I successfully reach Mommy or Daddy, I reveal myself to them. They always appear relieved to find out it was me and not a ghost.