public static function spin($color, $amount){
		$hsl = $color->toHSL();
		$hue = fmod($hsl['h'] + $amount->value, 360);

		$hsl['h'] = $hue < 0 ? 360 + $hue : $hue;

		return Less_Environment::hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
	}