There's something about tagging and graffiti that I admire as an art-form and as an anti-establishment movement. Recently though, starting with the infamous Banksy getting more known to a wider audience, graffiti artists are becoming common and are even making a living as "respected artists". For example, Faust, a graffiti artist in New York, is known for his calligraphy tagging. The beautiful typography is ironic, as VNA Magazine said, "a coalescense of highbrow and enderground".
Even governments have finally caved to graffiti; cities that have frequent tagging issues will often have a wall dedicated to graffiti. This validation of graffiti artists have allowed graffiti artists to make a living doing what is supposed to be illegal. Faust has teamed up with brands such as Nike to produce clothing, shoes, and posters. However, just because Faust has been working with these big companies, his anonymity is still preserved.
Anonymity is a huge part of being a graffiti artist. There's no point of being a graffiti artist if the public knows who you are. The focus is on the work, not the artist. So, although Faust "sold out", I don't believe he's lost the spirit of being an anti-establishment figure because he's still vandalizing New York.
So in response to the photographs of the Quantam Physics' chalkboards being sold, I have none. There's nothing wrong with making money off art because everyone needs to eat. But once you abandon the spirit of the art, I'm looking at you George Lucas, that's wrong.