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sorry gary that is not what I meant - wahat I meant was to see the green circles sepererately per row, as I cannot focus on one row only

as far a your examples go... 15 is easy, 20 is difficullt,...

the full size is actually esier than the thumb nail for me

it would be interseting to try them as seperate images - with the full image they all 'pull together' so to speak for me, I cannot do...

personally I think there is an optimal ratio: size/distance from, which will vary from person to person

6 by 6 I would have to stand back quite a bit