Emergency Pad down

Advertising - reverse, for example panels in the bus stop; playing nintendo at the coffee machine; using signs to leave traces of messages/poetry/art to public space: text left on Madrid public space, roads; the calligraphy machine; gay friendly traffic lights; reverse signs of the roads;

Messages in hidden places, or "none places". Poetry underneath the bridge made by De Ploeg artist [[1]] Poetry on walls in different languages in Leiden.

Insertion of sound to place, to introduce something that's normally not there. Women's voices in men-dominated squares. Light hack in the park, help connect marriages.

Artistic interventions that are large scale, creating iconic effect and aesthetics. Yellow Duck and Christo and Jean Claude sculptures.

Political messages of SpY

Conversion of empty spaces, by community initiatives to public leisure places, such as garden, green space, farms. 9 ingenious urban hacks