I made an illustration about building an extension to your house, or rather the economics involved in doing so. This is what I first came up with:

While nobody thought there was anything wrong with it, apparently it was too similar to this (which I also made for the same issue):


Well, back to the drawing board, and out came this rather different little piece. It's a cottage extended into a chateau:



This on the other hand nobody liked at all... If the problem is small the fix should be small too, so I remade the first one into this:


End of story. Everybody's happy.

(This post doesn't look it's best in Internet Explorer, because of issues with transparency)