As you draw your house, you spend most of your time in a normal xy plane…easy…
But adding stairs, or an elevator, makes you coordinate space on 2 or 3 floors. Sure, the pull up of a rectangle thru 2 floors is easy. But now you see the power of doing your own 3D design.
Plopping a 3’x4’ rectangle in the middle of your blueprints, so it aligns just right on all 3 floors, is powerful stuff.
By drawing this out yourself, you PROVE the elevator or stairs DO make sense on each floor, within an inch or two, in all directions.
The elevator stuck out into the living room too much on the main floor, so I moved it back about 20 inches.
But, now this bump out, gives the table a sense of room/place, and a place for a massive piece of art.
It also creates tall linear shadows, or different colors of white paint in the area.
It created a 12 foot all book shelf only 1 foot wide, but 3 foot deep… and a place for trash.
All this because the floor plans had to be compressed on one floor, it rippled up to the 2nd floor.