[OJFord]

In EE blackboards were mostly replaced shortly before / while I was there a few years ago. Whiteboards are _vastly_ inferior for two reasons in my view:

1. Colours are harder to distinguish, or to see at all. Chalk is easy, even a brand new pen is difficult from more than a few rows back, possibly made worse by my colour blindness;

2. You can't go over an existing pen line. You can _sort of_ make it thicker (but typically remove part of it at the same time) but you can't draw a square and then go over one edge in red, for example.