<http://schema.org/keywords>
"sky, night, sun, person, dawn, cloud, day, wide angel, wooden, seat, hill, plane, clouds, orange, human, art, dusk, wide, 8mm, heaven"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/22024505/a-day-ends-by-tom-h->