text: function randomPointOnCircle(radius) {
  	var angle = Math.random() * 2 * Math.PI;
  	return {x: radius * Math.cos(angle),
  			y: radius * Math.sin(angle)};
  }
  
  function randomRange() {
  	if (arguments.length < 1) {
  		throw Error('`randomRange()` requires at least one (integer) argument.');
  	}
  	else if (arguments.length == 1) {
  		return Math.floor(Math.random() * arguments[0]);
  	}
  	else {
  		return arguments[0] + (Math.floor(Math.random() * (arguments[1] - arguments[0])));
  	}
  }
  
  