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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

Light art is a form visual art where main media expression is light. Light has been used for architectural aesthetical effects throughout human history. However, the modern concept light art emerged with the development artificial light sources and experimenting modern art. Examples light art include works by Dan Flavin, Olafur Eliasson, James Turrell, Waltraut Cooper, Aleksandra Stratimirovič, Austine Wood Comarow, Tim White-Sobieski and many others...