Sudan's Hassan Musa on how he shares art on envelopes
22 January 2014 Last updated at 19:38 GMT
Hassan Musa is a Sudanese artist currently exhibiting at The Gallery of African Art in London.
Besides his work on fabric and ink on paper depictions of 20th Century icons in Arabic calligraphy, part of the exhibition features hand-decorated envelopes that he sent to his curator, some of them beautiful, some of them funny, but all of them eye-catching.
The BBC's Jenny Horrocks went along to the gallery and asked him when he first started using calligraphy.
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