@djb @nixCraft Found the source: https://matt.might.net/articles/phd-school-in-pictures/
@jc Back when I did helpdesk for a product that a lot of medical doctors used, this would've been fun for them to comprehend, instead of assuming the person they call doesn't have high enough IQ to tie their shoelaces.
@jc @nixCraft which gives me an excuse to repost this from Simon Wardley. Started as a joke and then it just took off
https://blog.gardeviance.org/2008/04/three-stages-of-expertise.html