You may think the art of showing is a modern concept, but it's always been the mark of good writing. Here’s an example from the 1857 novel, Madame Bovary. If Gustave Flaubert had been a lazy writer, he could have said, "Charles Bovary was a boring person." Despite being a trifle long, he makes us see and feel Charles:
Charles’s conversation was as flat as a sidewalk, with everyone’s ideas walking through in ordinary dress, arousing neither emotion, nor laughter, nor dreams. He had never been curious, he said, to go and see a touring company of Paris actors at the theatre. He couldn’t swim, fence, or shoot, and once he couldn’t even explain to Emma a term about horseback riding she had come across in a novel. (p.60)
Showing brings life to your writing and makes readers part of your story.