[EdZ]

I do agree that feels can and do change slightly, and that 'getting used to' a feel may alter the spectrum (buffer) of percieved changes/differences in the future. That said, I agree with Homer that one uses "feel" to reproduce, if nothing else by the ability to notice change, to notice 'being off track', more than 'being on track'.

Perspective obviously is a huge factor, where you are coming from influences how you get to where you are going. Certainly the flat vs upright changes would feel different depending on which direction you are going, just as in the classic example of placing one hand in hot water, one in cold and then moving both to warm water.

Feel may be relative, but it is critical to the feedback loop in learning.