Let's see if I can get this thing to work:
This is from the movie "Goal". Just over the crest of the hill is the 'mexico/us border', which our plucky protagonists are trying to illegally cross.
The chain link fence that you see at the top of the photo is the set.
The big white thing in the lower corner is diffusion - this is a 12' by 12' 'grid cloth'. It softens the light, so that it doesn't cast so many shadows and make the actors look like crap.
Diffusion is grip, BTW.
The rule of thumb is that a light (or anything carrying electricity) is electric, and anything between the light and the actor (color, diffusion, flags, etc.) is grip.