These links relate to the unconscious bias discussion on the If you’re not aware of your unconscious bias, you’re holding yourself back podcast (with Paul Tizzard).
This is the illusion discussed in the podcast about how persistent the subjective experience is, even when we know that the objective truth is different.
In the picture below, squares A and B are actually the same colour, but our brain shortcuts this level of detail and shows square A to be darker than square B. This is because the pattern of the chessboard is enough for the brain to fill in the blanks, it ignores the detail of the exact shades of grey.
This illusion persists even when you know it’s not true.