Researchers have developed a new type of soft robot, dubbed "morphobot," capable of self-organizing and moving collectively in response to light. These robots, barely 1 centimeter in size, are made from a light-sensitive polymeric material that allows them to change shape and, consequently, movement. The key to their operation lies in the interaction between the robot's shape, the photosensitive material, and ambient light, enabling them to exhibit complex swarm behaviors without the need for external control or individualized programming.

The design of morphobots is based on integrating the robot's physical form with the properties of its material. When exposed to light, the polymer contracts or expands predictably, generating movement. This "design for interaction" approach allows the robot's shape and its material response to combine to produce emergent behavior. For example, morphobots have been shown to exhibit collective phototaxis, meaning they move as a group towards a light source, a common behavior in simple biological organisms.

This advance represents a significant step in swarm robotics, offering an alternative to traditional systems that require complex control algorithms and communication between units. The ability of morphobots to self-organize through physical and material interactions opens new avenues for developing robots that operate in dynamic and complex environments, such as exploring confined spaces or targeted drug delivery. The simplicity of their design and the absence of complex electronic components make them robust and scalable, with potential applications in biomedicine and microfabrication.