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The Droste effect with Screen Sharing

The so-called Droste effect, where a smaller figure is placed inside a large version of itself, is also easily made live when a camera is used to film the screen on which its image is displayed.

I accidently rediscovered it a few years ago, while testing the performance of the Screen Sharing facility of Mac OS X. I used Screen Sharing to work on a Mac Mini from my laptop. Then, inside this session, I shared the screen of the laptop again, so that I had the screen of my laptop directly in front of me, and inside the Mini's screen sharing session, the screen-shared version of it. Since this is the equivalent of the camera situation, the Droste effect was there.

Droste effect with screen sharing
The Droste effect, generated by a screen sharing loop between two computers. Here is the full-size version of the image (1.6 MB).

As there some delay in the passing of the new image over the network, you actually see the image building up. Thus, you can make a screenshot that shows an intermediate step.

Droste effect with screen sharing, building up
A late step in building up, where you can distinguish on the left that the contextual Dock menu has not yet reached the end of visibility. Here is the full-size version of the image (1.8 MB).
Droste effect with screen sharing, building up
An earlier step in another building sequence. In the center, the desktop picture of the laptop is clearly visible. Here is the full-size version of the image (1.5 MB).