We have seen plenty of cool shape changing robots here. ShapeBots happen to be shape-changing swarm robots that can change their configuration to display information or move objects. ShapeBots change their shape by leveraging small linear actuators that are thin (2.5 cm) and highly extendable (up to 20cm) in both horizontal and vertical directions.
The actuators have a modular design to transform to various shapes. The above video shows what ShapeBots have to offer.