The best object to provide scale on a photo showing a small object is…

Update: maybe there should be a "tennis ball" or "table tennis ball" option too?

Update 2011-02-25: added matches.

Update 2011-04-27: done in The best object to provide scale on a photo showing a small object is:.

In reply to Re: poll ideas quest 2011 (pencil or coin to show photo scale) by ambrus
in thread poll ideas quest 2011 by pollsters

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