Have you ever seen the Spider Fairies? No, I suppose you haven’t.
They slink about about on winter mornings just before the frost has time to melt, spinning the frozen spiders’ silk into balls of yarn to take back to their hidden homes. There they weave window frames and doors. You see, only frozen spiders’ silk can hold magic properly, if a fairy enchants anything else the power ebbs away until all that is left is the ordinary. Spiders’ silk however holds onto magic and so they use it to make their homes. To keep the humans from peeping in.