Well, just about any photo taken within Seattle city limits was taken on a hill, mirabile . . .
But yes, technically you're right. This particular hill is running south, but the shot was taken facing slightly southeast.
Here's a slightly more revealing view:

This is one of those many West Seattle things — like the "Dont Tread On Me" medallion from last week — that hides in plain sight. However, unlike the medallion, which was a small thing, this is quite a big thing.
A great big thing, in fact.
In spite of its size and its (one would think) striking appearance, we have become so accustomed to seeing it every day, as we whiz by on our Segway personal transporters, that our awareness of it has been gradually shifted and re-shifted within our brains. Until, finally, it gets filed away in some dark little cubby-hole labeled "permanent storage" — alongside the billboard advertisements, speed limit signs, and other cortico-subliminal junk mail.
And I can't believe I actually just said that . . .