1. A process for spatially referencing a self-clocking glyph code that is composed of logically ordered data glyphs that are selected from a predetermined symbol set for encoding information in said data glyphs; said process comprising writing said logically ordered data glyphs in a two dimensional field on a recording medium in accordance with a predetermined spatial formatting rule; writing a synchronization code in said field, said synchronization code being composed of logically ordered glyphs that are distinguishable from said data glyphs, said synchronization code being written in said field in accordance with said spatial formatting rule plus at least one additional rule that establishes a predetermined geometric relationship among the glyphs of said synchronization code and said data glyphs, whereby the logical ordering of at least some of the data glyphs in said field is inferable from the glyphs of said synchronization code based upon said geometric relationship.