Aside from reading, most of what children are observing are 3D objects in 3D space. Reading comes right after the developmental stage when children have mostly

Aside from reading, most of what children are observing are 3D objects in 3D space. Reading comes right after the developmental stage when children have mostly full object permanence and consistency. They finally understand that the same object can be viewed from many different sides, flipped around, turned upside down, and still they are the same thing. Except in reading!