Abby built that entire tower of Duplo Blocks pretty much on her own tonight. I built a short wide base and she very carefully and deliberately stack the very tall thin tower of blocks. The best part was when she had a block in both hands, as she attempted to stack the block in her right hand she realized she had grabbed the block upside-down. Rather than dropping the block in her left hand to help adjust the right hand block she put the miss-grasped block in her mouth adjusted her grasp on it and then placed is successfully on the tower follow shortly by the block in her left hand. Watching the intensity and focus with which she went about her building was very cool.