Possible Duplicate:
How does the User card work?

I just noticed a new drop-shadow effect on certain Gravatars.

It makes my profile image look a little silly (see for example this answer of mine).

I've also noticed that it's not applied to every Gravatar -- see the profile images of this random question I looked at.

So... what was the rationale behind this drop-shadow? What controls when it appears?

Most importantly, is there a way to turn it off?

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