time flow concept man scientist glasses looks hourglass teacher student with beard studying library |
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| navigate by keyword : adult background beard book bookcase bookshelf bookshelves bookworm cabinet caucasian college concept education explore eyeglasses face flow glasses handsome hipster hold hourglass intellectual intelligence interior knowledge library literature look man over read research science scientist serious sit smart student study table teacher time university unshaven vintage watch wisdom young |
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| Time flow concept. Man, scientist in glasses looks at hourglass. Teacher or student with beard studying in library. Man on serious face watching time is going over, bookshelves on background. |
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