In the past it used to be confusing when you changed to a 3D view and the 2D objects would be all over the screen. Planar graphics lets you choose to have the 2D objects appear like a 3D object.
The planar graphics can not be colored, or rendered.
There is some great protected information here that is only available to paying subscribers. You must be an active paying subscriber to see it, but you can Subscribe here.