Black-and-white photography is “trending.” If you can remember when that was the only kind of photography there was … well howdy ol’ timer, welcome to the Internet. For the rest of you, it was captured on “film” and you took the exposed roll of “film” to a local pharmacy, where they sent it off to be “developed” and “printed.”
(You might find examples of early 20th-century, black-and-white photos in the chest your great-grandmother left you.)
Carlos Alexandre Carollo made this retro image of the London Eye, slowly turning, in a 30-second digital capture. He then converted it to black and white with a computer program, discarding 16 million shades of color.