Legos could cover an inch thick across our entire house. He is the most amazing builder. I don't understand how he can put together complex structures without any pictures or instructions. When I play with him he's got this speed boat, complete with motor, steering wheel, driver, etc and I am not even half-way through making a simple brick house with a window. He's 6 and puts together those lego sets for older kids by himself. He'll make a great engineer or architect one day.