Step 2: if (Step 1), then this is possible: an “overnight” inversion followed by semantic adaptation (applying ‘red’ to glowing coal, ‘blue’ to the sky, etc.), but with memory of one’s experiences before the inversion. That is, one (re)learns to use color terminology like a normal person, while remembering that one’s experiences of glowing coal (etc.) used to be very different. The inversion remains detectable, because one asserts, for example, that one’s experiences have drastically changed.