Koncepce toku času. Učitel nebo student s vousy studovat v knihovně. Vědec v brýlích vypadá na přesýpací hodiny. Muž na vážnou tváří, sledování času bude nad regály na pozadí. - Stock fotografie a obrázky

Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific research concept. Man on thoughtful face between piles of books in library, bookshelves on background.

Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Man on excited face between piles of books in library, bookshelves on background. Scientific discovery concept.

Scientific discovery concept. Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Man on shocked face between piles of books in library, bookshelves on background.

Librarian concept. Man on thoughtful face stands between piles of books, while holds hourglass, bookshelves on background. Teacher, scientist with beard stands at table with books, defocused.

Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific research concept. Man on surprised face between piles of books in library, bookshelves on background.

Man on surprised face holds hourglass while studying, bookshelves on background. Time flow concept. Man, scientist in glasses looks at hourglass. Teacher or student with beard studying in library.

Man on happy face between piles of books in library, bookshelves on background. Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific research concept.

Man on strict face sit between piles of books, while studying in library, bookshelves on background. Teacher or student with beard sit at table with hourglass and glasses, defocused. Bookworm concept.

Man on strict face sit between piles of books, while studying in library, bookshelves on background. Bookworm concept. Teacher or student with beard sit at table with hourglass and glasses, defocused.

Bibliophile concept. Teacher or student with beard sits at table with books, defocused. Man on hopeful face between piles of books, while studying in library, bookshelves on background.

Man on thoughtful face holds hourglass while studying, bookshelves on background. Teacher or student with beard studying in library. Man, scientist in glasses looks at hourglass. Time flow concept.

Man on thoughtful face holds hourglass while studying, bookshelves on background. Teacher or student with beard studying in library. Time flow concept. Man, scientist in glasses looks at hourglass.

Reading authority business book. Business experience. Decision making part management. Man bearded businessman thoughtful face inspired by book making decision. Business decision. Useful information.

Man on strict face sit between piles of books, while studying in library, bookshelves on background. Teacher or student with beard sit at table with glasses, defocused. Bookworm concept.

Man on confident face stands between piles of books, while studying in library, bookshelves on background. Teacher or student with beard stands at table with books, defocused. Librarian concept.

Teacher or student with beard sits at table with glasses, defocused. Bibliophile concept. Man on strict face between piles of books, while studying in library, bookshelves on background.

Librarian in the library. Man on thoughtful face holds hourglass while studying, bookshelves on background. Teacher or student with beard studying in library

Librarian concept. Teacher, scientist with beard stands at table with books, defocused. Man on thoughtful face stands between piles of books, while studying in library, bookshelves on background.

Man with beard and mustache sits on armchair and reading, white wall background. Macho spends leisure with book. Connoisseur, on serious face enjoy literature. Connoisseur of literature concept.