Carefully, Lark wiped the morning's fingerprints from the perfect and clear glass sphere that sat on the counter near where they totaled up purchases.
It didn't have a whit of magic in it on its own; instead it would fill with the magic of its proper owner. Everyone touched it, of course, out of curiosity and the chance they might catch a glimpse of more than their own smudges.
So far, nobody had gotten more than a faint little curling wisp of possibility from it.
Oh, but when they did-
-Lark would adjust the price accordingly.