Leonardo puzzled over how we can see a single
world of solid objects given the different eye views (now known as Leonardo's paradox), but he failed to grasp the critical point that retinal disparity is not a problem but is the basis for stereopsis.
The standards covered in Unit 6 are: describe
objects in the environment and the relative positions
of these
objects as above, below, beside, in front
of, behind, and next to, classify and sort, correctly name shapes, identify shapes as 2D or 3D (flat / plane or
solid), analyze and compare two and three dimensional shapes, model shapes in the
world by building shapes from components, and compose simple shapes to form larger shapes.