I had to pass a Department of Interior practical captain test (written and on-the-water). The guy administering the test said, "You need to be able to tie a bowline in 20 seconds or less."
No problem.
Then he said, "Oh, I meant you have to tie it behind your back."
That was a new one for me, and I just made it. I thought I was done with that part of the test.
Nope.
"You have to tie it behind your back, with your body in the loop."
My mind was racing while I made a bit of small talk to give me some time to think it out. Just made it.
That was the last of the "on land" portion of the test, then we headed out for a "workout" on the water. One of the things I had to do before shoving off was teach a first mate how to tie a rolling hitch.
As a former sailor, I had some working knowledge of the 5 or 6 knots we used most often.
I can see where an animated display would be very handy.
Jim