I always find it amusing to think that one builder somewhere decided to spark up a blunt and utterly fucking destroyed one of the most culturally significant buildings in the entire world, and probably only he knows he did it
Because they're dark they need direct lighting, with a blue tint preferably
Your two best options are either lighting from underneath, or from concentrated spotlights from above and away from them. So spotlights with narrow beams, on the ceiling above but a metre or so away from the shelf