Foster 501 Sofa. is made by Brand Walter Knoll. Details and photos of Foster 501 Sofa. are displayed above. You can also check other products in Furnishings category. Brand Walter Knoll / Furnishings Furnishings products by Brand Walter Knoll 375 Stool. Jason Lite Cantilever Chair. Saddle Barstool. Modern Icons: Fabricius Armchair. Jaan 781 Sofa. 375 Armchair.