HirstArts dungeons - interior walls eating up floorspace? in Conversions, Presentation, and Terrain Posted February 26, 2008 When my group used them prior to our top down projector setup, I made some loose tiles and painted them red. We then used these red tiles as "voids" where movement wasn't allowed for these circumstances you mentioned. That's at least how my group worked with preprinted plans. Before we cam up with the "void" idea, we were just adding that extra space in the tiles into the mix (until one of our rules lawyers threw a hissy fit).