I think it was upon seeing the house tour of Renee Zellweger on Apiece Apart (via Remodelista) that I started tracking these low slung, legless modular sofas. Hers is the Extrasoft Sofa by Piero Lissoni for Living Divani. The Fulham sofa at Restoration Hardware is an alternative. Roche Bobois, Minotti and Montauk all have offerings that sing from the same songbook.
I'm not sure what really living with these would be like. Would you really reconfigure them regularly? Would it be too much to always be sinking, nearly prone, into such a cushiony depths? Still, in images, they look like the perfect place to while away a Sunday afternoon with books and movies and cups of coffee.