"Unintentional art" generally refers to anything that was created with no real artistry in mind, something functional, ordinary, accidental, but, from the standpoint of an artist looking at it, is amazingly, accidentally artistic. I find this sort of thing all the time and take exceptional delight in it.
Here's an example. While walking down a street in Kyoto, I came upon an old rusty metal wall. Most people wouldn't take a second look. Except me.
There's so much to love about this little scene. The weathered metal, the wavy corrugations that give the metal depth, the gorgeous color of the rust, the complementary colors of blue and orange, the mysterious door with no handle, no doorknob, the soft light which creates a lovely glow.
Teaching photographers to see is a huge challenge for an instructor. I've always said, "You can't shoot it if you don't see it." Awareness is everything. So this bit of unintentional art, accidental art, commonplace materials, if you are aware, jumps out and just begs to be photographed. Or painted. Or simply admired. A wonderful gift to those who really look.
©2019 Carol Leigh