An interesting fact is that all the complex computations, that lead to predicting the ball trajectory and positioning the hand accordingly, is off-loaded to a more powerful (stationary) computer which in turn sends the digested results to the robot.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/blog/show/robot-catches-two-balls-at-once-humans-wish-they-could