It is the ability to mentally picture things. That seems the most natural thing in the world, but some people are unable to do it at all. They cannot imagine a sunset, see any vivid details, vibrant colours, in their minds. Or they may only produce a mental image that is blurry and lacks detail. Michael Bacon, the Armchair Warrior, is a USCF Expert with aphantasia. He has written about how the condition relates to chess. | Image Credit: Andrew Mason