Photo credit: XOOOOX Basel (4c), (c) by Matthias Burkhalter.

Photo credit: 798 ArtDistrict Beijing 001 (4c), (c) by Matthias Burkhalter.

Photo credit: Street Art 001 (4c), (c) by Matthias Burkhalter.

Photo credit: Street Art 001 (BW), (c) by Matthias Burkhalter.