@Olie29 - my post inspired by yours.
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Calligraphy - much softer but much the same. A detail from Madrid - a spot that is reworked frequently. You need to check often to see what's going on. I agree completely with
@William Dobson - some of the best contemporary art you are going to see can be called graffiti. Tags and calligraphy - these are co-joined concepts for me, stencils, whatever. On the right of this picture - what can you conjure with a single line? Have a look at classical Arabic calligraphy - particularly the Kufic script. The latter is angular like the work you have shown. It reads right to left. Generally it's only used for Koranic references but it's a beautiful script. Yours - I.
@Barry Giddens - another good example of a picture that only showed its value up-side down.