Meaning of reflected plan

reflect'ed plan'

Pronunciation: [key]
  1. a plan, as of a room, taken as seen from above but having the outlines of some upper surface, as a vault or compartmented ceiling, projected downward upon it so that a part that would appear at the right when seen from below appears on the plan at the left.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.