Here’s a bit from The Working Proof‘s website:
The Working Proof seeks to promote art and social responsibility. Each print is paired with a charity of the artist’s choice, to which we are donating 15% of the sale of each print – creating what we believe to be a product with not just aesthetic, but social value. Besides showcasing emerging artists and great artwork, the intent of the Working Proof is to promote a variety of charities and to expose them to new supporters through the appreciation of art and creativity. We release a new print once a week, on Tuesdays at 1:30 pm, EST.