...who is definitely on the vertical.
Or someone climbing a vertical wall such as this one in Zion National Park.
...or the yet more well known El Capitan in Yosemite.
Do you see them--there just at and above the horizontal light streak?
But since my daily horizon view of the vertical was made spectacular the other evening, I chose the hop poles as my header. It came too late to use for last week's theme of something red.
The other header challenge members can be found in my sidebar.