Algodoo

I would like to see what people think of when they see these symbols. And im curious if anyones gonna get it right. The only hint that i will give you is the fact that the map name would be gravity swap. Say what you think they are in the comments. And I will check to see if anyone gets it right (the reson im doing this is for my upcoming map called gravity swap, and I like people to learn on there own. Insted of having text tutorials. This is testing wich one would be better)