You learn some pitfalls by playing. When flying indoors, if you get too close to the ceiling, it experiences something like ground effect and quickly vacuums itself to the ceiling and then crashes to the ground. I was trying to use a drone to clear out inaccessible dust bunnies. I'm not sure that collision avoidance could save it from that crash. There is lots of room until a fraction a second before there is no roomFlying weed whacker comes to mind.