Add active ball indicator

[quicksilver24]

Balls sometimes launch themselves into outer space. Sometimes they come plummeting back to earth, sometimes they stay in orbit - never to be seen again. Or warp themselves out of existence. Other than clicking to see if you can drop a new ball you don't know if there is one coming back down or not.

Could just be show/hide on the 'click here' message. Or a traffic light red/green icon kinda thing?