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I am a proponent of the use of expanding foam sealant as a landscape base. This stuff comes in cans at the hardware store, with a spray nozzle and long straw-like tube for getting into the cracks around doors and windows. Basically, you get to sculpt hills with a spray-paint can! For a gentle landscape, it works rather optimally, as you just provide a table surface below the level of your intended scenery, spray on a small amount of the stuff, watch it bloom up into randomized landforms, then after it cures you can carve away any mistakes. The carvings can be reused as well, just nestle them into the next application. On top of this, you can place any finishing plaster or papier-mache that you choose. You'll end up with a highly varied topography (unless you choose to carve it all flat) which, because of the solid foam under the plaster, readily holds trees and other "planted" materials. The advantage over foam boards is that the bumpy surface happens naturally; it can take a lot of carving to make a formed board not look so flat. Of course, for certain areas you might prefer a smooth slope, and for these you ought to use pieces of foam board.
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