  Large-scale shape-changing interfaces have great potential, but creating such
systems requires substantial time, cost, space, and efforts, which hinders the
research community to explore interactions beyond the scale of human hands. We
introduce modular inflatable actuators as building blocks for prototyping
room-scale shape-changing interfaces. Each actuator can change its height from
15cm to 150cm, actuated and controlled by air pressure. Each unit is low-cost
(8 USD), lightweight (10 kg), compact (15 cm), and robust, making it
well-suited for prototyping room-scale shape transformations. Moreover, our
modular and reconfigurable design allows researchers and designers to quickly
construct different geometries and to explore various applications. This paper
contributes to the design and implementation of highly extendable inflatable
actuators, and demonstrates a range of scenarios that can leverage this modular
building block.
