The shiny tiles are available in dark hues of black, blue and green, as well as lighter shades ... measuring 7.5 by 15 and 7.5 by 30 centimetres, plus a hexagonal design and a square that both ...

but after the sun goes down it looks like a green-and-black night sky. The hope, Hudson-Powell says, is that the tiles can bridge night and day and allow someone to move through a dark room ...