Comment by dghf

So at the end, I'm shown a full-screen gradient from green to blue, with a line showing where my personal boundary between green and blue lies.

Except that when I look at that gradient, it seems to me that the actual transition lies much further to the left, roughly in the middle of the screen: i.e., I'm being told that I consider a significant range of colours to be green that, on this final page, appear to me to be quite clearly blue.