I'm really curious to try this. It's interesting how we tend to veer off course when trying to walk straight, and cool to see an idea of how to exploit it.

I used to do gymnastics and as part of that I trained doing long series of cartwheels along a marked line. I managed to get good at doing it without deviating from that line. I looked straight ahead and it went fast enough that everything was a blur. However, I still couldn't do it with my eyes closed.