I'd guess you'd want to roll them into balls.. perhaps not "constantly" though. I've been keeping the one I got in a piece of tupperware near a window since I've yet to decide where I want to put it. I did split it.. and sort of reform it into 2 ballish shapes. And they still don't look much different than they did then.. although a bit bigger. I presume that I should pinch and pull and roll to get them into ball shape again since I don't have a lake and wave action to do it for me.