Why did Robert Hooke use the term cell after observing cork?

In 1665, English physicist Robert Hooke published his famous work, Micrographia, in which he documented his microscopic observations of various natural objects. When examining a thin slice of cork, Hooke observed a honeycomb-like structure consisting of tiny, empty cavities surrounded by walls.123

He introduced the term "cell" to describe these structures because the cellulose walls of the dead cork tissue reminded him of the small, sparse rooms—or "cells"—occupied by monks in a monastery. While Hooke correctly identified these as the basic structural units of the cork, he did not realize at the time that they were the fundamental building blocks of all living organisms, a concept that would not be formally established as cell theory until nearly two centuries later.32