Btw, you could use Tim’s application of Variable Spatial Encoding. That would allow you to have a 2-card system with just 676 images and encoding one image per locus.
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Would it help to include semi-wave. For me the semi wave is a tenative (unsure) wave of the hand. I actually have ocean wave too.
So would the semi-wave motion of John Williams help or hurt the image?
My old image (for several reasons) was never satisfactory; conducting a symphoney with semaphore flags.