Tyler's Favorite Block Piece

We're not sure why, but regardless of what other block pieces are around him, Tyler always goes for the round block piece and puts it in his mouth. He then proceeds to go about doing whatever he wants with the block in his mouth. Even today, while we were at his friend Ben's house, Tyler proceeded to pick up Ben's round block piece and do the same thing (see picture). We wonder how long this odd, yet funny, behavior will last....