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The sphere is a BB (for a BB gun) measuring .172". The scale is 64ths of an inch.
The pin is the same .023" thing in the 2nd Exhibit E photo (and a couple of the stone-face shots).
The brush was there because the BB had a tendency to roll away.
I was moving an LED around and liked the way light reflected off the crystal facets, so I decided to sequence the 3 shots in an animated GIF.