This figure is a six sided object known as a hexagon - comprised of six triangles. When first viewed, this is what we “cognitively” described for ourself in our “visual cortex” - with or without “verbalizing”. It is a two dimensional rendering of a two dimensional object.
Introducing the concept of dimension, our visual cortex may have re-calculated the cognitive description as a two dimensional “perspective” representation of a three dimensional object - a (wire frame) hexahedron or - a cube. Experience with perspective drawing may have invoked the three dimensional cognitive description without alluding to “dimension” but either way, we had to mentally “re-calculate” the image. Furthermore, once we have re-processed the image, we may have encountered a visual ambiguity. Are we looking at the cube from above or below an “imaginary” horizontal reference plane? We can perceive the cube both from a vantage point “above” and “below” the cube. And we can switch back and forth between both vantage points. When we are able to do this, is it seamless? Or do we “hesitate” at the two dimensional hexagon?