Modern militaries use camouflage to blend-in with the background. The patterns are intended to make even moving people or vehicles almost invisible, but it wasn’t always that way. Early naval camouflage looked much more fabulous, and they were called dazzle lines.
These patterns simply made it hard for the eye to focus on a ship, and occasionally used tromp l’oeil-like methods to give ships false dimensionality. The method was originally designed to confuse the eyes of German gunners, who had to aim optically. Commanders debated the effectiveness of dazzle lines, but it was universally accepted as a way to boost troop morale. I can’t blame them, either — ships with dazzle lines look pretty cool.
By the end of WWII, radar targeting had rendered optical aiming (and dazzle lines by exception) obsolete. Military minds changed their camouflage strategies and the psychedelic-looking patterns of WWI and WWII became a historical footnote. I had never even heard of the method until my friend Mike told me about it last week.

Militaries may have abandoned dazzle lines, but the concept lives on elsewhere. One example is the carpeting in casinos. The dizzying patterns provide no calm space for eyes to rest except for on a slot machine or poker table.
Have you noticed a dazzle effect anywhere else, even unintentionally? We’d love to hear about it in the comments.
-Tom
EXTRA EXTRA
We have recieved two great extra ideas about dazzle lines.
A project called CV Dazzle by a Brooklyn based artist. The idea was to use makeup/hair to:
“to break apart the gestalt of a face, or object, and make it undetectable to computer vision algorithms, in particular face detection”

The second appearance of dazzle lines is so obvious, and perhaps the inspiration for military dazzle lines; zebras. The second theorised reason for zebra having stripes listed on wikipedia is:
Since zebras are herd animals, the stripes may help to confuse predators—a number of zebras standing or moving close together may appear as one large animal, making it more difficult for the lion to pick out any single zebra to attack
Looking at the below picture, it sure seems likely:

Please hit us up with any more examples.
-Tristan
Physical painted lines are obsolete, but in a sense, the same concept applies to radar jamming and electronic countermeasures. The best way to keep from being targeted is to add more information than the targeting device can handle.