This couch doesn't have drop shadows and an unnecessary
'loading' animation, metaphorically speaking. This article
is a great description of the product of what good designers
do. It's cheap to manufacture. Easily deployed and assembled.
Well suited to its primary purpose. Incorporates multiple
additional uses without compromising the primary use. Flexible
enough to be reconfigured easily for different locations. Best
of all, it doesn't have any unnecessary 'design'
frills. — HN Comment dicussing Ikea furnature

In otherwords, good design is discovering what you think is a new use case for a product and then realizing, "the designers obviously already thought about this." Good design is the complete lack of arbitrary decisions.

Design, Innovation and Hacking in a couch