Quote Originally Posted by ButterflyWoman View Post
It's all in how you construct them. It doesn't have to be a castle wall made of stone. It can be like a tea bag, too, that allows most stuff to circulate freely, but keeps some stuff out. Or in.
....it would have been a lot more interesting for everyone if you would have asked "then what do you use or do instead?" MUAHAHA now no one will ever know \(^o^)/