I worried about that too when I was writing this. I thought the bed was “too hard” but I needed a size allegory, not hardness. According to Mighty Book, the large bed was too hard. So really, you’re right, and I cheated.

If I were to pretend that I were much smarter than I am, then I would claim that I was referring to the Goldilocks Principle, which is generally applied to any extremes.

Sadly, wikipedia is inspecific about the beds, and only vaguely references the chairs: http://en.wikipedia.org/wiki/Goldilocks_and_the_Three_Bears

Thanks for doing research and accidentally vindicating me.