All images are licensed under a Creative Commons Attribution 4.0 International license

Photo attributions

Demonstration in Madrid to celebrate the fifth anniversary of the birth of 15M / Manifestación en Madrid para celebrar el quinto aniversario del nacimiento del 15M by Adolfo Lujan is licensed under CC BY-NC-ND 2.0.

Pilsen Smart Communities Murals by Daniel X. O'Neil is licensed under CC BY 2.0.