text: function Wall(x, y, w, h) { // Walls to keep the player from falling off the edge of the world!
  	
  	Game_Object.call(this, x, y, w, h); // Class inheritance.
  	
  }
  
  Wall.prototype = Object.create(Game_Object.prototype); // Also inheritance.
  Wall.prototype.constructor = "Wall";
  
  Wall.prototype.draw = function(pencil) {
  	
  	pencil.beginPath();
  	pencil.fillStyle = (pencil.world ? "#000000" : "#FFFFFF");
  	pencil.fillRect(this.x, this.y, this.w, this.h);
  	
  }