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I wonder if this could be used to make traffic corners slightly less dangerous. If it could be scaled up enough, you could maybe put a tube diagonally through a hedge, with a big viewing assembly on one end.

Otherwise, i'm a bit at a loss as to possible uses of this.

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In this setup it looks like you can't obscure the center of the cylinder defined by the lenses. That's where the background light goes. So the cloaked region is actually a long tube with a hole through the middle, and probably wouldn't work for street corners. It's a neat demonstration though. It seems like the point is to show cloaking with the simplest materials and optics possible.

> the cloaked region is actually a long tube with a hole through the middle

Exactly, and if you can make that hole small enough and long enough with the viewport being large enough, you could use this to tunnel view through static large structures that aren't bothered by small tunnels through them.

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