building stones of atoms were discovered

An example of metaphor in the writing of scientists:

"…despite the great success attending the discovery of the building stones of atoms – a discovery depending on the application of classical concepts – the development of the atomic theory has, nevertheless, first of all given us a recognition of laws which cannot be included within the frame formed by our accustomed modes of perception."

"Negatively charged particles, the so-called electrons, which are held within the atom by the attraction of a much heavier positively charged atomic nucleus, enter as common building stones in all atoms."

Bohr, Neils (1934) Atomic theory and the description of nature. Cambridge University Press