Full Idea
The visible forms of nature are eight: earth, water, fire, air, ether; the mind, reason, and the sense of 'I'.
Gist of Idea
The visible forms of nature are earth, water, fire, air, ether; mind, reason, and the sense of 'I'
Source
Anon (Bhag) (The Bhagavad Gita [c.500 BCE], 7.4)
Book Reference
'The Bhagavad Gita', ed/tr. Mascaro,Juan [Penguin 1962], p.74
A Reaction
Presumably there is an implication that there are also invisible forms. The Bhuddists launched an attack on 'I' as one of the categories. The first five appear to be Aristotle's, which must be of scholarly (and chronological) interest.