This is called Piano Keys.

I took it in my front room.

It represents leading lines because it has a line you can follow. 

 This is called The Hike Out.

I took it in the middle of no were.

It represents Asymmetry.

This is called The Wall.

I took it in my room.

It should represent symmetry because both sides should be the same, and I tried to get the corner in the middle but I think it is slanted slightly.