Number processing can evoke spatial representations and cause lateralized attention shifts. The article by Wood et al. suggests interesting considerations about the mental space of numbers by pointing to a difference between physical and numerical space processing. We read Wood et al.'s findings in a perspective that takes into consideration a currently debated issue, that is the relation between Simon and SNARC effects. By pointing to a difference between peripheral onsets and numerical targets, indeed, their finding suggests that the hypothesis of a complete overlap between Simon and SNARC effects is less plausible than a partial overlap hypothesis.