Tractor or me?

Every few weeks Dan takes a picture of my progressing big belly.  Today I asked him to take a new picture of me and he says "Only if I can take it in front of the tractor".  What?  What does the tractor have to do with pregnancy pictures?  Oh, well, I gave in.  So here is a pic of me at 32-weeks standing in front of the tractor.  I'm not exactly sure which you're supposed to be looking at though.  :)