I've got several images that I've cataloged as white-on-white, but until making this photo I had never made an image that is both truly white-on-white and only white-on-white. If both the subject and background were the same tones of white, you would not be able to distinguish one from the other. So, the definition I'm using of a white-on-white image is when the subject is slightly darker than the background (and in this case also the tabletop).
I take one of these Vitamin D-3 pills with my daily breakfast. I think my doctor prescribed them because she couldn't stand the idea of someone my age not taking any pills.
Setup
The tabletop and background are a single sheet of translucent vellum. Small continuous-light lamps on both sides fitted with a diffusion filter make the background the brightest area of the scene. Flags next to each lamp prevent too much light from spilling onto the objects, allowing them to remain darker than the background. A medium continuous-light lamp in the left front area mostly brightens the tabletop and front of the bottle cap to help define its shape. Its light also overpowered the light spilling onto the objects and the shadows created by the other two lamps, which then created shadow tones on the right side of the objects to help define their shape.