private TileType GetTileType(ITile tile)
		{
			switch (tile.Type)
			{
				case "floor":
					return TileType.Floor;
				case "wall":
					return TileType.Wall;
				case "passage":
					return TileType.Passage;
				case "door":
					return tile.HasTag("open")
						? TileType.OpenDoor
						: TileType.Door;
				case "stairs":
					return TileType.Stairs;
				default:
					throw new System.ArgumentException();
			}
		}