Animals use the geometry of their surroundings to establish their orientation. However, the system of geometry-informed navigation fails to reach abstraction in two points. First, it fails to encode some geometric information, namely angles. Second, it also fails to recognise geometry in 2D displays, a main domain of Euclidean geometry. . As reviewed in the present chapter, this system is sensitive to angle and length, while it ignores distinctions of sense: it is thus complementary to the geometry-informed navigation system, which encodes length and sense, but not angle.
Our results indicate that when classifying shapes, sensitivity to angle and size is universal, while sensitivity to sense is not
Space, Time and Number in the Brain