Koncepce toku času. Učitel nebo student s vousy studovat v knihovně. Muž na vážnou tváří, sledování času bude nad regály na pozadí. Chlape vědec v brýlích se dívá na přesýpací hodiny. - 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.

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.

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.

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

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.

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, 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.

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

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

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.

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 busy thoughtful face reading book, bookshelves on background. Education and science concept. Teacher or student with beard studying in library between piles of books.

Bearded man with lots of books preparing for exams

Relaxing and reading concept. Hipster relaxing with book and cup of tea.

Education for adults. Hipster eccentric student hold pile books. Study hard. Language courses. Buy stationery. Adult student. College textbooks. Creative hipster. Personal diary. Freak student.

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.

Bright and vibrant. Man bearded cheerful smiling hipster wear orange color sunglasses while hold orange fruit and book notepad. Total orange. Guy long beard likes orange color. Vitamin source.