<http://schema.org/keywords>
"blade, blue, bright, circle, close-up, condensation, dew, droplet, drops, grass, green, lake, lawn, leaves, liquid, macro, meadow, morning, ornamental, plant, rain, river, stem, summer, sunlight, sunrise, surface, tropical, water, wet"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/5519786/string-of-pearls-by-bui-hung>