" Wood does not customarily glitter. Few things do, unless they are attempting to lure something closer to themselves. Sparkle and shine are pleasures reserved for predators, who can afford the risk of courting attention. The exceptions - which exist, for all things must have exceptions - are almost entirely poisonous, and will sicken whatever they lure. So even the exception feeds into the rule, which states that a bright, shimmering thing is almost certainly looking to be seen, and that which hopes to be seen is persuing its own agenda. "

― Seanan McGuire , In an Absent Dream (Wayward Children, #4)