"(Ptolemy) left in his Optics, the earliest surviving table of angles of refraction from air to water. ...This table, …"

"As men of inward light are wont To turn their optics in upon't."

"Music is the arithmetic of sounds as optics is the geometry of light."

"Why has not man a microscopic eye? For this plain reason, Man is not a Fly. Say, what the use, were finer optics giv'…"

"Contemporary with Vitellio and Peccam was... Roger Bacon, a man of almost universal genius, and who wrote on almost e…"

"For any man with half an eye, What stands before him may espy; But optics sharp it needs I ween, To see what is not t…"

"There has always been a good deal of mystery surrounding the pinch harmonic, or, as hip players like to call it, “pic…"

"In short, pick squealing, or pinch harmonics is part of the reason why a lot of people started using copious amounts …"

"The way I and most guitarists produce a pinch harmonic is to grasp the pick close to its pointed tip with your thumb …"

"When you pick the string just right, a higher pitch other than the fretted note is sounded. This higher pitch is an o…"