Hello! I'm new to this list, so I apologize if this topic has already been considered. I have been re-creating the Laser Game tutorial in Pharo 6, and have encountered something that may be an error within Pharo. The LayoutFrame has the ability to use negative values for the bottom and right sides of the rectangle assigned to the offsets, e.g. LayoutFrame fraction: ((0@0 corner: (1@1)) offsets: ((4@4 corner: (-4@-4)). This is useful, as it allows the system to automatically calculate the margins inset from the bottom and right sides of the container. In Pharo 6, this does not work. The setLeft:right:top:bottom: and setPoint:point: messages both use the min: and max: messages to rearrange the Rectangle so that the smallest numbers get pushed to the top and left. In order to get things to render correctly in my system, I had to change these messages to look like this: setLeft: left right: right top: top bottom: bottom self setPoint: (left@top) point: (right@bottom). setPoint: pt1 point: pt2 origin := pt1. corner := pt2. In place of this: setLeft: left right: right top: top bottom: bottom origin := (left min: right) @ (top min: bottom). corner := (left max: right) @ (top max: bottom). setPoint: pt1 point: pt2 origin := (pt1 x min: pt2 x) @ (pt1 y min: pt2 y). corner := (pt1 x max: pt2 x) @ (pt1 y max: pt2 y). I haven't found any bad side-effects to changing this yet, but is there a reason the Rectangle class was changed? Thanks, Trey