public void lookAt(float x, float y) {
		final float tolerance = (float) Math.PI / 9;
		final float angle = (float) (Math.atan2(y, x) - Math.PI / 2);
		if (physics.getRotation() <= angle + tolerance && physics.getRotation() >= angle - tolerance) {
			physics.setRotation(angle);
		} else if (physics.getRotation() > angle + tolerance) {
			physics.setAngularVelocity(-15);
		} else if (physics.getRotation() < angle - tolerance) {
			physics.setAngularVelocity(15);
		}
	}