You can make a disk of app size and put in two holes say the size of a ten cent piece...opposite each other on the same diagonal and say a distance apart similar to the radius...when outta focus you see two disks thru the ep or viewer and when focused you see only one disk.
You can use two triangles such that when in focus you see a star.
You can make these easily.
I am going to make one even though I have the Bat mask.
Alex
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