public static Tetromino spawnRandomTetromino()
	{
		double rand = Math.random();
		if (rand > .86)
			return new SquareTetromino();
		else if (rand > .72)
			return new LineTetromino();
		else if (rand > .58)
			return new RightLTetromino();
		else if (rand > .44)
			return new LeftLTetromino();
		else if (rand > .30)
			return new LeftZigZagTetromino();
		else if (rand > .15)
			return new RightZigZagTetromino();
		else
			return new IntersectTetromino();

	}