photo courtesy of KEF!
Based in Aachen, Germany, KEF! is a young artist who uses the walls of different European capitals to expose his abstracts looking characters, Kef and Kefline. Expressive and playful, these seem to appear inconspicuously with their curious looks and cheer up the most unexpected urban places. Molempire had an interview with KEF!.
Home page of KEF!
(thanks Andrei)