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Did I just see something move?

Tooling around YouTube -- for work purposes, I'm sure -- I noticed a little flash of motion in the right-hand column, that vertical stack of thumbnail images from the "up next" videos that the algorithm chooses for us. 
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SEE ALSO:New YouTube feature lets fans 'tip' creators during live streams
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SEE ALSO:New YouTube feature lets fans 'tip' creators during live streams。A few minutes later, as I went scrolling through the column, and ..。it happened again
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! The "up next" videos' display images moved in short loops -- just like a GIF.。

It only happens when you mouse over the thumbnails, but it definitely happens: 。Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletter 。By signing up you agree to our Terms of Use and Privacy Policy. 。

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Apparently, not everyone's seeing it yet -- right now this tiny tweak to the interface is just an experiment that's only out to a few select users.
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We asked YouTube what the deal was, and they played it coy: 。

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"With more videos coming to YouTube every minute we're always experimenting with ways to help people more easily find, watch and share the videos that matter most to them," YouTube said in a statement. "We'll consider rolling features out more broadly based on feedback on these experiments."。

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Our feedback, for the record: Cool!

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Our feedback, for the record: Cool! Go for it.。

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