I think I was working through Betty Edwards book Drawing on the Right Side of the Brain when I did these negative drawing sketches.
Definition: Negative space is the area of an image not occupied by shapes or forms. This part of the drawing is often neglected, or filled with casual scribbles. Negative space drawing involves concentrating on drawing the background, leaving the object white - an excellent exercise in observation.
I remember sketching the above plastic chair on our back deck while sitting in a matching chair.
This one is a painted vase (?) with an attached saucer.
And last ... a sugar bowl that I had put some silk ivy in.
I haven't thought about negative drawing much in the last few years, but I do remember how much I enjoyed the look once I was done.
If you haven't done any negative sketching in awhile maybe now would be a good time give it another try.