The glass box metaphor: seeing “through” the object
The “glass box” is a traditional metaphor used to demonstrate how each view in an orthographic drawing is projected from the object parallel to the opposite face of the glass box. If the box were made of paper it could be unfolded to reveal not only the orthographic views as projected, but also the alignment required of orthographic projection (see figs. 2 and 3).
For perspective, the glass box metaphor translates more specifically into the transparency required to accurately construct a multisurfaced view in a single drawing. Transparency conceptually allows the designer to treat the object ...
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