| Gets the bounding box associated with the object, either explicitly (directly
associated to the object) or (if not explicitly available) implicitly (inherited
from a higher level object).
Remarks
The box represents the physical-coordinates frame expressed in default
user-space units. This frame is crucial for the proper positioning of graphic
elements on the canvas, as the spec [PDF:1.6:4.2] *sadly* states that the
coordinate system is positively-oriented, although the typographic coordinates
would be conveniently expressed as negatively-oriented.
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