Room dividers can be the ultimate solution for small spaces. For anyone trying to do more with less, the most important big screen in the house may not be LCD but, rather, cardboard, plastic or felt.

There’s the Axioma, a $90 cardboard table; the Tetra, a $50 side-console; the Infinix, a Miami-hued side table for $85; the Byo, a cardboard room divider costing around $175; the Exa, a $90 ...