The Tongue of Concentration

Zak often pulls in his top lip and sticks out his tongue when he's working on something. This is Zak right after his first officially sanctioned trip out the door by himself (we didn't want him hitting his head on the concrete slab, so we've been bringing him out up till now). When he managed to escape out the door (which he had to pull open enough to fit through), and under the security gate to go outside this morning I figured we don't need to worry about him hitting his head anymore. (Now we've got a new set of worries- escape artist anyone?!)