[EricH]

Watching this thread, I have seen many suggestions about higher walls or nets over the top. Here is what I think about this: 1) If the game involves human players throwing things over the wall, neither a higher wall nor a net is practical. If one is used, the humans should have their own area and hard hats. 2) If the game does not involve throwing objects, a net that directs the objects to the ground in a certain area, like behind the player station, is probably the best choice. A higher wall will only block anything that is lower than its top.
3) Until FIRST decides to do something, which may not happen for who knows how long, just be careful.