Venice, Italy, is known for a many things, but one of the most popular ones is the amount of pigeons the city has. The birds are most famously found congregating in St. Marks Place. On a sunny day, the whole piazza can be covered in them like a feathery carpet. The pigeons, as iconic as they are, are not welcomed by all. Around the world, they carry the nickname "rats of the sky" and they're not known for being the cleanest creatures. However, during Venice's 2012 biennial, two Berlin artists decided to make pigeons more appealing. Or at least the...