A ballistic-gel test dummy in a hoodie and jeans, glued to his monitor and typing comments – clear amber gel around a skull with eyes and a brain, a spine, ribs, a coil of gut and the bones of his limbs. Click anywhere to swing the sledgehammer: the gel ripples, tears and throws off wobbling chunks, and every hit plays back in high speed. Swing hard enough and he goes off the chair. Drag to orbit, Shift-drag to pull the gel.