I must be dense. Can you help?

[ralph]

I had two comments on my PAD of yesterday that mentioned my image was also a good "SP". I also noticed another member in their PAD gallery described one of their PADs as "SP". I'm sure there is a simple and logical explanation for what makes an image "SP" but so far I can't think of what it could be. Anyone care to clue me in?

http://www.pbase.com/ralph

[donna_lear]

SP = self portrait

[ralph]

SP = self portrait

Duh, I should have guessed that! Thanks for setting me straight.