Labelling is an important part of organization and communication. The ‘blank’ tape cassette could be imprinted with any meaning, message or metaphor of the authors choosing. As well, many different methods could be used from the elaboratly artisitc, to the simply informational.
DwarfMcDougal , pokes fun at the meta labelling that occurs in this photo, with “note on notes“. The notes feature in flickr is really handy I have to say, and any effort to include notes (or descriptions, or tags) to contributions to the project is greatly appreciated.