How do you build butterflies?

These look like butterflies with blue wings, but they’re actually small robots. The machines are called emotion butterflies, and they can stay in the air for up to four minutes at a time. Engineers were able to build them by precisely mimicking the natural movement sequences of real butterflies. Small infrared cameras enable them to fly around one another without colliding. The robo-insects represent a technical breakthrough that could revolutionize the control systems in factories with networked machines and monitoring systems.