Give an example of how an architectural feature might shape an interior decorator's furniture choice and placement.

Well, if we take penthouses as an example, often these have roofs that are sloped, so one part of the room is taller than another. That's why an interior decorator knows how to adjust things like closets or where to place beds and similar things to prevent the slope from bothering you during your everyday activities.

He developed the concept of linear perspective, and he had the ability to solve architectural problems using mathematics.