The other day i was watching a show or movie I forget...but on the dude's desk was this glass rectangular 'box' with water in it and it would go to one side then the water would flow to the right then when the water reached the right side the box would tip to the left then the water would go to the left..and this would repeat to infinity I guess...it's like a balance...something you see on someone's desk...i want one lol where can i get this? I don't know the proper terms to search in google and i can't seem to find it.