I know someone with aphantasia who is an excellent mathematician, I asked him what he does instead of visualising and he says that he does mathematics with the

I know someone with aphantasia who is an excellent mathematician, I asked him what he does instead of visualising and he says that he does mathematics with the kinesthetic feeling of arbitary imaginary limbs. This may possibly explain why he is one of the very few people I know who seems to experience no conceptual jump in difficulty when solving problems that have 4 or more dimensions when compared to solving those with 3 or less.