Full Idea
Epicurus said that body was conceived as an aggregate of shape and size and resistance and weight.
Gist of Idea
Bodies are combinations of shape, size, resistance and weight
Source
Epicurus (Principle Doctrines ('Kuriai Doxai') (frags) [c.290 BCE])
Book Reference
Epicurus: 'The Epicurus Reader', ed/tr. Inwood,B. /Gerson,L. [Hackett 1994], p.89
A Reaction
[Source Sextus 'Adversus Mathematicos' 10.257] Note that this is how we 'conceive' them. They might be intrinsically different, except that Epicurus is pretty much a phenomenalist.