When the country's President Mohamed Morsi ordered the graffiti near Tahrir Square to be cleaned up, filmmakers in Cairo caught the action on camera and a new revolution was born. (Click on CC on the bottom right hand side of of the YouTube player for English subtitles).

Jeff J Mitchell/Getty Images

It was a nice day for some painting. :-)

Graffiti na rampa #valeRio2016 #justnow #paint #riodejaneiro #travel #photography #byvaleriadelcueto

Graffiti on the walls of Europe’s old churches reveals the real Middle Ages – a world far removed from knights and damsels.

We spoke to 3 female and 3 male street artists about the challenges of being a woman who tags.

Ten graffiti terms and phrases most commonly used in street art and graffiti culture. The meaning behind symbolic phrases and jargon from the graffiti world.

Google Street Art has doubled its online archive by adding some 5,000 images, bringing the tally to 10,000, with coordinates pinpointing exact locations on all five continents.

New York City graffiti legends who shaped the graffiti art movement we know today. There is no doubt that all ten of graffiti legends featured on the following list shaped the graffiti art movement as we know it today, and inspired generations of young street artists worldwide.

Character by Time, Letters by Venom

Here are the ten most fascinating documentaries and fictional street art movies that tell stories of the global movement and its impact on urban culture.

;-)

One spring day in 2001 a tall man walked into Sheffield’s Park Hill flats and along a street in the sky. He strode past the brutalist flanks, out on to the footbridge. He thought: this’ll do. Jason didn’t look down; he gets vertigo and he was 13 storeys up. He leaned over in his yellow Puffa jacket and sprayed her name. “Clare” came out haphazardly and “Middleton” hit the ledge. He planned to take her to the Roxy on the facing hill, to show her. So now he began again, bigger, clearer: “I LOVE YOU WILL U MARRY ME”.

I used some old spraycans (from around 1998) for the scrub-fill and did the rest with new paint. Starting to discover a quite powerfull contrast between the smooth of the new and the rough and uncontrollable of the past. Evolution of technology and chemistry in one piece. More experimenting needed. :-)

In Australia, graffiti is protected by copyright, even if it was painted illegally. Enforcing that copyright can get tricky though, since the artist could still be arrested for vandalism. Why wouldn’t similar protections apply in the United States?

It should not be presumed that the beginnings of what we consider street art today necessarily define the notion. To say It began with graffiti is no mistake.

The “edgy authenticity” of street art makes it an ideal tool for urban planners seeking to attract the new "creative class".

It was a nice day. :-)