Why did Robert Hooke use the term cell?

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In 1665, the English physicist Robert Hooke published his famous work, Micrographia, in which he documented his microscopic observations of various natural structures.12

When examining thin slices of cork, Hooke observed a honeycomb-like network of tiny, empty cavities. He coined the term "cell" to describe these structures because their appearance—specifically the cellulose walls surrounding the empty spaces—reminded him of the small, simple rooms, or "cells," occupied by monks in a monastery.1345

While Hooke’s discovery was a foundational moment in the history of cell theory, he was observing the rigid cell walls of dead plant tissue rather than the living contents of the cell itself.435