Visual perception uses 2.5 dimensional arrays
Visual processing occurs through four stages of construction (see detailed text) resulting in three-dimensional structural description with a hierarchical structure.
The Stages of Construction

1) Visual information is gathered by recognition of intensity differences.
 
2) A two-dimensional primal sketch is made, which orders visual information into a representation of edges and other surface details.
 
3) From that primal sketch a 2-and-one-half sketch is constructed to include depth and movement features of the physical surfaces of the object.

4) Finally, the 2-and-one-half dimensional sketch is compared with other stored two-and-one-half dimensional sketches.

The result is a three-dimensional structural description with a hierarchical structure.

David Marr and Keith Nisihara, 1982.
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Visual perception uses 2.5 dimensional arrays
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