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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...

Dutch artist Henk Hofstra created this project in 2007. Blue Road is 1000 meters long and 8 meters wide. It was created to form an urban river which recreate the path of a waterway that used to be where the road currently runs...

In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through a material; translucency (also called translucence or translucidity) only allows light to pass through diffusely. The opposite property is opacity. Transparent materials are clear, while translucent ones cannot be seen through clearly. When light encounters a material, it can interact with it in several different ways...