On Land

Environment Information
At Rill Architects we run ArchiCAD on Mac OS X. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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This layer is for operator elements which you would like to show in plan.

Example: You can use the filleted disc and box objects to cut a ceiling, and display those cutting elements in the plan with a dashed line. You still have to draw them over in the RCP, but two elements is better than three.

Another example: A slab subtracted from a wall to make a niche.