A body (10) is disclosed for obscuring a light source arrangement (3). The body comprises a surface (20) including a plurality of optically reflective relief structures (30, 30′, 30″), each relief structure comprising a first portion (31) and a second portion (33) adjacent to said first portion extending from said surface, wherein the first portion has a different optical reflectivity to the second portion and neighboring optically reflective relief structures are separated by an optically transparent medium contacting said neighboring optically reflective relief structures. Also disclosed is a luminaire comprising such a body and a method of manufacturing such a body.