Figure-ground research

Figure-ground examples
1.Man/Woman - I think of figure-ground as finding an image within an image, like this one with the negative space shows a man playing a trumpet but in the white space it's a half of a ladys head
http://www.cs.washington.edu/homes/xren/research/eccv2006/

 2.Love - I thought this image was a little odd, it shows a man as the letters 'o' and 'v' and a lady as the letter 'L' but I can't figure out why the 'e' is placed where it is
http://www.evereverse.com/portfolio/figure-ground/