He smiles. "Good. Light color also matters, for the record, that's harder mode. You'll know when you're an expert because you'll be able to go into a dance club with the flashing, color changing lights and maintain control."

"But sticking to light and color. My portals are the deepest shadows and they contain every color. if you could see that sort of thing, it's like a swirling rainbow. That's why my shadow blankets and other things I make from them look like spinning galaxies. You've seen one, right?"