I always thought that I could learn tennis better if I could see how stupid I look while I was playing, rather than looking at a video later on.
Now if there is anyone out there on the 'net who ends up building a visualfilter, come one over for a game sometime. I'll send my outbound transmit signal to your inbound receive, and vice-versa. I'd be seeing myself from your point of view, and you from mine. I think we'd both miss the ball a lot, but after getting used to the system, we'd probably catch a lot of our mistakes right away. We'd close the loop with near-zero learning latency.