How come a few shirts are not present in the Gallery? The only two I can name offhand are the "Angels Have The Phone Box" shirt from April or May and the "Calvinball" shirt from last week. Do their artists have specific clauses in their contracts about their shirts' appearance in the Gallery?
The most common reason seems to be artists who have sold the design to a new company or site, and don't want this one to show up in google searches.