New waves, new people, old glimmers and old sounds.
A glimmer of knowledge will be sought after at Hogwarts. People on the border of darkness will always have a glimmer of light to guide them, either hiding in the shadows and following the light, or putting down the glimmer and running towards the darkness.
Ungwy Grindelwald, he took the shimmer and told them to go back.
Concept: the choice between inside and outside when involved in the whirlpool