[ethanwillis]

  It is the most common way of trying to cope with novelty: by means of metaphors 
  and analogies we try to link the new to the old, the novel to the familiar. 
  Under sufficiently slow and gradual change, it works reasonably well; in the case 
  of a sharp discontinuity, however, the method breaks down: though we may glorify 
  it with the name "common sense", our past experience is no longer relevant, the 
  analogies become too shallow, and the metaphors become more misleading than illuminating. 
  This is the situation that is characteristic for the "radical" novelty.

On the cruelty of really teaching computing science Edsger Dijkstra

https://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/E...