Mental word-pictures.

For me, it's just words. I am not at all a visual person, and I absolutely and unequivocally think in words. I recognise the difference between thinking and talking to myself, but even my most internal thinking is done in words. For a few years in my late teens, I had two thinking languges, English and German, but now it's just the one, although I did dream in Italian once.

noho ora mai
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