Nathan Richardson was at Hualien Taiwan.

He was facing east with the sun setting behind him in the west.

©Nathan Richardson, shown with permission.

The shadows appear to curve across the sky and as they get farther away they seem closer together and eventually converge towards the antisolar point.

Anti-solar or anti-crepuscular? Both terms are used but they can be seen at any time of day and not just during twilight (Latin - crepusculum). And anti-twilight could be the motto of some kind of eternal daylight action group.