New types of wallpaper under development or entering the market in the early 21st century include Sports Wall Decals that blocks certain mobile phone andWiFi signals, in the interest of privacy. The wallpaper is coated with a silver ink which forms crystals that block outgoing signals.The Spanish firm Think Big Factory has announced that they are developing a Glow In The Dark Wall Decals wallpaper which also serves as a computer interface, using projectors, webcams, and motion sensors for control. As of 2013, The hardware was complete but only 20 per cent of the software was finished, according to Think Big Factory.