Muž na zamyšlenou tváři drží PřesýpacíHodiny při studiu, regály na pozadí. Učitel nebo student s vousy studovat v knihovně. Vědec v brýlích vypadá na přesýpací hodiny. Koncepce toku času. - Stock fotografie a obrázky

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

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

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.

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

Time flow concept. Teacher or student with beard studying in library. Man, scientist in glasses looks at hourglass. Man on serious face watching time is going over, bookshelves on background.

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.

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

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.

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

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

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, scientist looks at hourglass. Man on serious and shocked face watching time is going over, bookshelves on background. Time flow concept. 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 holds hourglass, bookshelves on background.

Man, scientist looks at hourglass. Teacher or student with beard studying in library. Man on serious and shocked face watching time is going over, bookshelves on background. Time flow 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.

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

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