Close up of a gold watch movement on a white surface

Black and white photo of a man in a robe

Black and white photo of a sea squirt on a rock

Drawing of a laboratory apparatus with a beaker and a flask on a table

Black and white drawing of two people reading a book

Drawing of a large building with a clock tower in the background

Painting of three birds sitting on top of a tree branch with leaves

Black and white drawing of a man with a beard and mustache

Diagram of a right triangle with a right angle and a right side of the…