What I've always wondered about this is what the experience is like during the transitionary period. Surely it doesn't instantly flip from completely upside-dow

What I've always wondered about this is what the experience is like during the transitionary period. Surely it doesn't instantly flip from completely upside-down to completely upright. Another question I had is could you learn to instantly switch between them? If you alternated between wearing the glasses and not every few days, would the adaptation period shorten each time? Would it eventually become instant? This is usually the case for motor skills e.g. controlling something with an inverted vs. non-inverted axis.