And therefore I shall now only mind you of one thing that you know as well as I, namely, that the rare Stone which is called oculus Mundi, if it be good in its Kind, will have so great a change made in its Texture by being barely left a while in the Languidest of Liquors, common Waters, that from Opacous it will become Transparent, and acquire a Lustre of which it will again be depriv'd, without using any other Art or Violence, by leaving it a while in the Air.
"Experiments and Considerations Touching Colours (1664)"
Robert Boyle
Animus tuus oculus, as the freshmen used to say.
"The Complete PG Works of Oliver Wendell Holmes, Sr."
Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)
Secundum quem modum oculus aut manus non potest dici per se subsistens, et per consequens nec per se operans.
"Ontology or the Theory of Being"
Peter Coffey