cluster of micro videos

I was at youtube the other day and saw something interesting. In the space in the top right corner of a video page, there was a cluster of tiny videos. About six. Different sizes. I hovered over them and each little box came to life to tell you more about that particular video. I didn't click. I thought "that is cool - I will need to look into that more later."

Now it is later. I can't seem to find it. Nor can I find mention of it anywhere.

I suppose I could craft an HTML gob made with six or seven embedded videos. But that seems like it would be problematic.

Surely this is a new youtube tool. But what is it called? How do i try it?
 
If you had the normal sized viewer up (not the HD) and the cluster of videos was in a box that was flush with the top of the viewer and extended about halfway down, that was an embedded advertisement.
 
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