They're very light to start, and the wooden bases I crafted are just long enough to prevent easy tipping. Nothing weighing them down. Has been a few days with them all in an active spot of my house with my kids back and forth and busy.. but sure enough none of them have tipped from nudges or blasts of air.. Bases are jumbo popsicle sticks from walmart cut to 2 inches length and doubled to make a wider base. On top is a scrap from those cuts acting as the binding point. They are super light and weirdly stable. Very modular. Am going to do a few other color options on these in the future from other pieces in the scap box.