The ‘B’ on Auschwitz I’s “arbeit macht frei” sign was placed upside down as a symbol of resistance by the prisoners who were forced to create it. This act went undiscovered by the SS. The inverted ‘B’ is now a reminder to, “never remain indifferent. Ind...
http://www.auschwitz.info/en/b-the-sculpture.html

Original tweet : https://twitter.com/tilbots/status/1363865049752875009