A Twitter bot by Amy Godliman, Out To Sea posts images of things glimpsed on the horizon.
It reminds me of a passage from Calvino’s Invisible Cities:
Despina can be reached in two ways: by ship or by camel. The city displays one face to the traveler arriving overland and a different one to him who arrives by sea.
The shapes that emerge on the horizon, silhouetted against the sun: are they islands viewed from the sea, or cities viewed from across the desert? Yes.