Max is a sofa created from a vintage cast iron tub. The seat is by Reestore, a design outfit. They have their way with, old, used stuff, giving sometimes quite normal (like this bathtub), sometimes more odd (like a shiney washing machine table) objects a second life as interior furnishings and so on. The vintage cast iron bath can have an upholstery in the fabric of your choice. Ergnomics are fine for single seater slouching or sofa for two.
Slouching: to droop or hang carelessly, as a hat.