He's walking.

I feel like the blurriness of the picture conveys a good sense of motion.

We were thinking that yesterday marked the first true day of "walking", as I would set him down on his feet and he would regularly walk 5-10 steps away rather than just sitting down right away. But then today he started pulling himself up on furniture and just walking away all by himself. And, when I come after him for something that he's not supposed to have, he tries to "run" away rather than crawl, so I think he's definitely walking now.