"Here’s a short geometry test: How many straight lines can be drawn connecting two points on a flat plane? If you make two angles on a triangle smaller, does the third get larger or smaller? If you split a square diagonally, are the two resulting triangles the same size or different?.."
"Is our understanding of basic geometric concepts innate? For centuries, psychologists and philosophers have considered the question, in forums ranging from Socratic dialogue to tests of an isolated, unschooled Amazonian tribe whose members are capable of the same basic geometric reasoning as people who learned to use protractors and compasses in school in Boston…."