Linear Algebra Pig

Please read this photo (with a bit more attention)… Can you see what it is? (Though I have mentioned it is a pig. =v=)

I posted thie photo in my Chinese blog in October 2007. At that time at one  Linear Algebra lesson, I looked at the draft of the adjacent boy by chance. The direction was as the follow photo shows. Suddently I saw a pig!!

I asked him to lend the draft to me to take a photo.

Some readers said they could not see a pig, so I photoshoped the photo to draw the outline. I am quite sure you can see the pig now!