My grandsons have an extremely large collection of the play sets. When they receive one as a gift, they assemble it and play with it for a day or two, then the imagination comes out and they take it apart and use pieces from everything and build what they design/dream. Grandma saved the Legos that my son had back in the late 70s, there was a storage tote full and then some. The boys love getting into those pieces to complete their designs. Space ships, Shuttle craft, boats, airplanes, tanks and what ever they can conger up. We live just a few blocks away and they will ride their bikes over to our house to get that one special piece out of the old Legos to complete their project! Legos are one of the most ingenious toys (I hesitate to call them toys) that were every designed and offered on the market. Oh, I almost forgot, my youngest grandson has attended several robotic camps at UNO, SAC museum and Creighton University and loves the large robotic building sets from Lego, ,I wish I could afford them for my boys, they are amazing.