I won't go to into the details here, but the paper highlights a striking finding: people with aphantasia are able to do three-dimensional manipulations in their heads better than people who can form mental images. Very much in passing, Kay et al. mention that "those with aphantasia significantly favoured using analytic strategies", where by "analytic strategy" they mean ways to answer the rotation tasks using logic instead of actual mental rotations. Apparently, some 30 or 40% of the aphantasics said that their strategy was to actually rotate things around mentally—while having no mental images to rotate!