Don't know what these are. Charlie? Anyone? Set of 4. Screwed to the top or bottom of a shelf, one could drop something cylindrical (but tapered) into them. (The inside diameter of the sleeve is about 1/2" or 9/16" and the height is about the same.) Another mystery.
Had to Photoshop *lots* of sensor dust specks out of this image, but many, many still remain. Sigh. I am very discouraged by this problem, no matter how careful I am when I change lenses.
Meta data says tomorrow, but my inattention to the camera's clock strikes again. Rather than 12:35 a.m. on the 6th (and a "future filler"), this was taken at 10:35 p.m. on the 5th.
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...