The harder the trip the less real-world signal and more brains's interpolation. We all have highly unique brains so although the principles are the same (fractals in visual and in mind, strange colors, mixing senses etc.) we all have such a unique take on it.
And since the same brain is just guessing and smoothing input, and the one processing the guesses, its guesses are so 'self-compatible' that it can literally make its own feedback loops (I had it multiple times, when tripping with closed eyes I began wandering further and further away on a very consistent interconnected trip).
Its so strange. I can remember those trips so well, but the 'enhanced' version of it is simply too vast for my normal brain to grok. Just partial projections like 3d into 2d that don't give full picture or don't make much sense.