Yanjaa Wintersoul, a 23-year-old with cheerful purple hair, is a memory champion. That's an actual thing, with contests where people have to memorize as many digits, decks of cards, historic dates and random lists of words as they can in a short period of time. Ikea, the Swedish home furnishings retailer, gave Wintersoul a quirky challenge to help unveil its 2018 catalog: memorizing all the obscure details in the book's 328 pages.