Eh, this has been known since at least the 1960s. See Segal, M., Campbell, D., and Herskovits, M. (1966), The Influence of Culture on Visual Perception, Bobbs-M

Eh, this has been known since at least the 1960s. See Segal, M., Campbell, D., and Herskovits, M. (1966), The Influence of Culture on Visual Perception, Bobbs-Merrill. And I wouldn't call it an example of visual perception being "hugely" affected by cultural. It's a highly peripheral effect, in my opinion. I am definitely on the anti-nativist side of almost everything in psychology, but the rest of this paper is equally hyperbolic.