German Oculus Placido Disk or Keratoscope Opthalmologist Tool decorative bowls cut in two places to

cut in two places to overlap

glossy surface that turns black on exposure to air

I've been thinking about this piece

with not an extraneous thing about it

German Oculus Placido Disk or Keratoscope Opthalmologist Tool decorative bowls cut in two places toI bought this old Placido Disk, or Keratoscope, not knowing exactly what it was, because it reminded me of Duchamp's "Rotoreliefs," and also because I thought it could serve as a great prop for all sorts of things, including perhaps a low budget Sci Fi film! I've since learned that this device, invented in the late 19th century, is an ophthalmic instrument used to assess the shape of the anterior surface of the cornea: a series of concentric rings is