The application of pattern recognition and reasoning to spatial and visual matters. The essence of spatial ability is the mental rotation of objects. It tends to have somewhat less g loading than have verbal and numerical ability, possibly not because it is less important, but because it has a higher threshold in g and therefore is mastered by a more elite group with a smaller spread over the spectrum, leaving less room to correlate as a result of “restriction of range”.
This is to say that, if edenists’ identification of occipital buns with spatial ability is correct, then people with occipital buns will almost certainly have high intelligence. It is readily observable that many intelligent people do not have occipital buns or high spatial ability (ex. Vox Day), hence the existence of at least one other trait cluster within the high intelligence cohort. Most notably, I think, is the brachycephalic profile identified by Europa Soberana with the flattened occipital bone (“planoccipital”).
Speculating a bit, I’ve noticed that the superstar type tends to follow this general build, particularly the high forehead bit and the stocky build. They seem to have inexhaustible energy and a life history that reads like an uninterrupted series of impressive achievements. Given their incredible physical health and high intelligence, these tend to be the smart, successful football players (with high Wonderlic scores) who later become entrepreneurs, executives, special ops guys (ex. Pat Tillman). Here’s a decent reference list of faces, with a lot of guys who fit this profile: http://www.bestmastersdegrees.com/smartest-players/