The visible and near-ultraviolet emission spectrum of the CH radical has been known ever since spectra of an ordinary Bunsen burner have been taken. – Gerhard Herzberg
A priest is he who lives solely in the realm of the invisible, for whom all that is visible has only the truth of an allegory. – Karl Wilhelm Friedrich Schlegel
The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things. – Leonardo da Vinci
Wars tend to be very public things, they are visible. There are correspondents traveling with the troops and you get daily dispatches. – Ron Suskind