Muž na údiv na tváři drží PřesýpacíHodiny při studiu, regály na pozadí. Koncepce toku času. Učitel nebo student s vousy studovat v knihovně. Chlape vědec v brýlích se dívá na přesýpací hodiny. - Stock fotografie a obrázky

Man on surprised face holds 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 thoughtful 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.

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.

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 surprised face sits near hourglass while studying, bookshelves on background.

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.

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

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.

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.

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

Scientific discovery concept. Man on excited 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 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.

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

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

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 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.

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

Deadline concept. Teacher or student with beard studying in library. Man, scientist peeking out of piles of books with alarm clock. Man on strict face looking at clock, bookshelves on background.

Man, scientist peeking out of books. Teacher or student with beard studying in library. Man on serious and strict face watching time is going over, bookshelves on background. Time flow concept.

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