An opeidoscope illustrates sound with rays of light, by reflecting from a mirror and projecting the vibratory motion of singing or speaking.
A fiberscope examines inaccessible areas.
A serimeter tests the quality of silk.
With a topophone one could determine the direction and distance of a fog horn.
Selenoscopes view the moon.
Xathometers measure the color of sea or lake water.
A goniometer measures the angles between faces.
Sometimes gratitude is in geometry.
With a helioscope one could look at the sun.
If you haven’t yet discovered Gohlke’s particularly resonant way of seeing, find his photos and look at them. Go back–over 40 years’ worth of images–look at the destinations of idea, noticing, feeling, interchanging interpretation and land. See all this, find it in his photographs. Then go look at the sky. Or the side of the building over there. Or that photo of Gohlke’s, the one with the shadow made by a line of gas pumps standing like sentinels in the sun.