Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster). [1]
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Ja, tvorac ovog dela, predajem ga u javno vlasništvo. Ovo se odnosi na ceo svet. U nekim zemljama, ovo nije zakonski moguće; u tom slučaju: Ja, tvorac ovog dela dozvoljavam svakome da koristi ovo delo za bilo koju namenu, bez bilo kakvih uslova, osim uslova koje nameće zakon.
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{{Information |Description={{en|1=Heavy mineral layers (dark) in a quartz beach sand (Chennai, India).}} |Source=Original photograph |Author=Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster). |Date=May 2008 |Permission= |o