| http://www.w3.org/ns/prov#value | - But I have found that people keep magnetic ones, usually on the fridge or file cabinet or other metal surface and they have lasting impact as they are a daily visual reminder.Post cards and business cards have a short shelf life, and I do not do large runs of them because I know that I may want to change them seasonally or promote another piece of art or have a different theme or colour.
 
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