Another thing that you could do is put some "white light sources" (they are just light, not a visible object), making it rather big (for example one on each compartment of the shelf, making each the same size than the compartment to reduce the circular illuminated spot) and give them very little percent of illumination, so it just reduces the shadow to an acceptable level.
Not sure if it will work, but you can try.
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If a long walk every day were healthy, mailmen would be immortal.
