набрала в гугле "сжимающийся мяч" и поиск выдал мне это: "Сфера Хобермана", а это из википедии: "A Hoberman sphere is an isokinetic structure patented by Chuck Hoberman that resembles a geodesic dome, but is capable of folding down to a fraction of its normal size by the scissor-like action of its joints. Colorful plastic versions have become popular as children's toys: several toy sizes exist, with the original design capable of expanding from 15 centimetres (5.9 in) in diameter to 76 centimetres (30 in)." (написать просто сфера Хобермана мне не позволило количество необходимых символов))