24 comments on “Tesseract

  1. Dear Paul, I am a tutor who just gave a 7 year old (precocious reader) Madelaine Engle’s ‘A Wrinkle in Time”. I was kicking myself for a way to show the student this geometric oddity. You have helped me more than you know with words and graphics in this piece! Deepest thanks.

    Liked by 1 person

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