Exactly! And yes, all those "magic numbers" are derived. For example... this.hSpacing = Array.prototype.slice.call(this.parent.blocks.filter( function(n)

Exactly! And yes, all those "magic numbers" are derived. For example... this.hSpacing = Array.prototype.slice.call(this.parent.blocks.filter( function(n){ return n < _this.parent.cols; }) .map(function(n,o){ return o.offsetLeft; }) ); Your function names and decomposition are indeed much easier to read. Thanks again, Neal!