Picture Joke

I put this picture up on Twitter last week with the caption Geddit? and it got as close to going viral as anything I’ve ever tweeted. Since I’m too lazy to post anything substantial today I thought I’d put it up here.

In the words of Roy Walker: “Say what you see..” though you will probably have to be a physicist who’s studied general relativity.

Some of those who did get the joke asked me where they could buy such an item. In fact I just wrote the Greek letters on with a whiteboard marker…

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