felt ball pit and one hundred ways to not make a bowl seating unit.

So in the mode of experimentation i am starting a felt ball pit. I have a very unrealistic ideal sitting unit for them and am trying to find something a little more engineer-able and fiscally practical (not to mention transportable by car) . I would like a squishy bowl able to sit 3-6 people but the shape going out on the sides from a smaller bottom is incredibly difficult to make (not that i haven't tried a with a few projects before) any suggestions are welcomed! I am looking ito making my own inflatables but if all else fails may somehow modify an inflatable pool. when someone leans against the back of it from inside the inclination is that it will tilt unless the same pressure is applied to the opposite side and there is a lot of weight on the bottom. This is what takes so long with installation art. Engineering. bleh. hours of frustration and failed efforts. but i cant wait to sit in the pit with a few people covered up to the arm pits in felt balls that i painstakingly make by the tons in pantyhose! (finally a good use for those infernal things!) a slide may be a bit over the top but would be loveley. The idea of public playgrounds for adults is enticing to me. all these expensive "toys" boats, atvs, shopping, computer games. and no good ball pits and slides that we can use without a child as an excuse. Sometimes we just want to jump on a bed and have a pillow fight for christs sake! maybe that is why there are so many grumps out there! It will be interesting to see how this tangent intwines with my art for the blind trampoline with video and black room style waterbed experience.