Friday the 13th : A New Concept

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In commemoration of today, Friday the 13th, 2009: I post the above conceptual, self-referential idea in numbers and letters. If done on separate pieces of paper: there are also thirteen pages, each numbered from 1 to 13.
That was my original concept of the idea, created on pieces of paper. I originally had this idea back in 1994 and today's date made me recall the idea. Self-referential ideas and conceptual art have long been of interest to me. This sentence is dedicated to Friday the 13th, 2009. This second sentence refers back to the first sentence. ....BLOG is a four-lettered word....