"The staircase forms part of a project called House Antero de Quental that involved converting the former home of a nineteenth century poet into a literary centre.The shelves are back-lit through translucent plexiglass and will hold 6000 books. The light comes above and behind the structure trough translucent plexiglas, by this effect the light is projected over the books as they should enlight their readers."
courtesy of dezeen