By Billboard, I mean something that turns as you do, such as the trees. Solid objects do not turn with you.
It's a little hard to explain technically speaking, so I shall use imagery.
Take this scene: I am standing outside the exit of Kanto Victory Road. If you look at these trees from a certain angle, a white line forms between the trees and the mountainous walls. I am very doubtful this is the only place where this occurs:
It's a little hard to explain technically speaking, so I shall use imagery.
Take this scene: I am standing outside the exit of Kanto Victory Road. If you look at these trees from a certain angle, a white line forms between the trees and the mountainous walls. I am very doubtful this is the only place where this occurs: