My son is 4 now. For his 3rd birthday we gave him a real hammer and a box of 250 nails because he learned pretty early on that the toy tools don't quite get the job done like daddy's do.
So watch out when you come to our house because you might just step on a board of nails. This artwork is everywhere. There seems to be more of it this spring because we have been building a deck.
Here is the piece he worked on last night while I was fixing dinner.
And a piece from a week or so ago that sat out in the rain.