Final answer:
The imaginary slicing of a floor plan is known as a Sectional View, relevant in both architecture for buildings and medical imaging for anatomy. It's essential for visualizing aspects not seen in regular floor plans or three-dimensional structures.
Step-by-step explanation:
The imaginary slicing of a floor plan is called a Sectional View. This term applies in various fields such as architecture and medicine. In architecture, a Sectional View is a representation of a three-dimensional structure as seen as if it were cut along an imaginary plane, showing the architectural design that would not normally be visible in a standard floor plan. Similarly, in medicine, scanning devices create virtual sections of the human body, and understanding these images requires knowledge of the plane along which the section is made. The planes commonly referred to are the sagittal, frontal (or coronal), and transverse plane. Anatomical body planes give us different views into the body, much like a Sectional View gives insights to the inner layout of a building design.