Imagine in 1970 someone reading Martin Gardner's Scientific American article describing 'John Conway's new solitaire game "life"'. Perhaps the reader played around with graph paper plus pencil and eraser to explore what could be done.
"Interesting", they might say. Or, "Fascinating!" even.
And then you show them this article. Just imagine how mind blowing it would be to them.
Original SciAm article -> https://www.ibiblio.org/lifepatterns/october1970.html