It's hard for a building to stand out in a city like London that has architecture dating from the Middle Ages all the way through today all designed by some of the most prominent architects of their time. But you don't have to make a whole building strikingly different just to attract attention. In fact, sometimes just a window is enough to catch the eye of those passing by.
For proof, just look to artist Shirazeh Houshiary, who designed this stunning window for the Church of St. Martin in the Fields in Trafalgar Square, London. The beautiful work features a unique shape right in the center of the window that serves as an optical illusion of some type of wormhole into another demension.