Drawing From The Left Side

This may not seem like much, just a man drawing a line down the left side of the paper, but for Dennis this is BIG.  Dennis's stroke recovery has moved ahead in one big leap, about a month ago, with better eye contact, and now being able to walk with the walker, unassisted.
While I was visiting him this week I pulled out the pad and said "draw" and without any instruction he moved to the left side of the paper and made lines in red and green. "Bravo Dennis"