Nick has been exploring his independence
Swimming/crawling by himself in the lake
Taking a spin in the boat (while docked)
Playing on the boat
But the best part of Nickolas finding his independence - is that he has realized that he already has the tools he needs to work with his ability to get moving.
Instead of crawling to go where he wants - he started to go to his walker, and then walk to where the watned to go!
