Dirty... that's what you don't show people,what makes you feel guilty because you haven't cleaned it up yet... and I must say until now I've never tried to find something dirty to photograph :)! That's the fun of PP !!
After some thinking I decided there were only 3 possibilities
1. "protest" photography (pollution ...)
2 humorous photography
3 or then sublimation...? Not sure that word is used in English... let's say idealization then!
I chose the last one and could write a long blog about "My old spider web with plenty of brown dust on it" and about the other ones in my hair, about my ladder, my lamps... :)
I turned the picture upside down... sublimation! :)