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The Mayor, a green cube with a top hat, goes "kaboom" in Wattam. The Mayor, a green cube with a top hat, goes "kaboom" in Wattam. The video game designer Keita Takahashi is best known for Katamari Damacy, released in 2004. It's about a god named the "King of All Cosmos" who, while drunk, accidentally destroys the stars in the sky. His son "The Prince" is left to clean up his mess by rolling up objects on Earth into sticky masses that grow so large they become new stars.

Both projects will be presented at the 2017 IEEE International Conference on Robotics and Automation (ICRA) May 29 -- June 3 in Singapore. In the first, five swarm quadcopters zip back and forth in formation, then change their behaviors based on user commands. The trick is to maneuver without smacking into each other or flying underneath another machine. If a robot cuts into the airstream of a higher flying quadcopter, the lower machine must quickly recover from the turbulent air or risk falling out of the sky. "Ground robots have had built-in safety'bubbles' around them for a long time to avoid crashing," said Magnus Egerstedt, the Georgia Tech School of Electrical and Computer Engineering professor who oversees the project.

Drone swarms can be used for lots of things, like creating holograms, putting on a Superbowl halftime show or collecting military intelligence. One of the problems with a bunch of quadcopters executing maneuvers in close proximity, however, is that they can crash when they touch or fly under each other. Researchers at the Georgia Institute of Technology have found a way to avoid both issues by creating a virtual bumper area around each copter so that they don't accidentally touch. They've also ensured that each copter has a little "top hat" of space above it so it won't go underneath another drone and get caught up in its airflow. Ph.D. student Li Wang figured out that the top hat must be as tall as five times the diameter from one rotor to another by flying drones atop one another.