code: function Millipede(size, options) {
      options = options || {};
  
      this.size = size;
      this.reverse = options.reverse;
      this.horizontal = options.horizontal;
  
      this.position = options.position || 0;
      this.top = options.top || 0;
      this.left = options.left || 0;
  
      this.validate();
  }
docs: Initialize a new `Millipede` with the given `size` and `options`.
  
  @param {Number} size
  @param {Object} options
  @return {Millipede}
  @public