Really Clever! These are some pieces of furniture that can be used in several ways. I found most of them from Urbanist's article and I've added a few of my own.
1 sofa+lounger+chair by Roel Verhagen-Kaptein
2 wall art+chair by Studio Dror
3 Mealbox by Igland Design
4 side table + bookshelf by Bertrand Pinceman
5 cabinet+kitchen+dining table
6 Tona Chair designed by Diego Gonazalez King.
7 Ilo by Carmela Niederhauser & Nadine Grau - designed to be converted from infant to teen years
Many thanks to Weburbanist and to Yanko.