A turned-on filament light bulb with a wire inside and a screw bottom.

Lit Filament Lightbulb

A tall bookshelf with four shelves and many rows of books.

Rectangular Bookshelf With Books

Two stacked books or folded clothes of different sizes on a shelf.

Three tall bookshelves with four shelves and many rows of books.

A row of many different standing closed books, as if they were on a shelf, in three quarters view.

An open book or magazine, facing back at an angle.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.