public boolean isPassable()
	{
		return (this == EMPTY ||
				this == dHORIZONTAL ||
				this == dVERTICAL ||
				this == dLEFTTOPCORNER ||
				this == dLEFTBOTCORNER ||
				this == dRIGHTBOTCORNER ||
				this == dRIGHTTOPCORNER);
	}