That ballon use here is fun... That's how they made the early foam houses... they would inflate a big weather baloon over 30-40-50 ft... lash it to the ground and then spray it with the foam... then do another one next to it.... they got some interesting effects wth it... like outcroppings of stone .. that became coffee tables in the living room of the house.. back in the 60's they had a bunch up at Yale they were working out the process for... seeing them got me into using foam and concrete in some new ways..
