Bones inside, skin outside, fat between. You hold the bones; the skin is blended each frame between the shape its bones imply and wherever the fat has pushed it — snout almost rigid, belly almost all fluid. The sack is sealed, so pulling it open sucks fat in behind rather than opening a free void. Drag a bone to move him.
drag squeeze the skin · R reset · space pause · D density · V velocity · S speed · P pressure · K skin