(1) Signature. Ordering is alphabetic. Within blocks of the same signature the next criteria apply.If you wish to look for a specific owl pendant whose photo and description may appear here, do the following steps. The clickable titles are links to Picasa Web Albums. Note (10-9-2013): after clicking the links below you will go to a Google+ display of the pictures without captions; a message will read "Click here to go to Picassa Web Albums."
(2) Number of Segments-Length-Weight. These terms are defined above. Ordering is from smaller to larger for each criterion. If the number of segments are equal, length determines order. If lengths are also equal, weight is used.
(3) Expository requirements. I have ordered some expository albums (e.g. Shared Parts) in a way that facilitates explanations.