No, this isn’t an annual report for a spy company. German design group, Serviceplan, came up with a memorable way to help its client, Austria Solar, demonstrate the power of its business by printing its annual report with a special ink that is invisible until exposed to sunlight. Shipped in a lightproof foil wrapper, the perfect-bound document looks completely blank, except for the blind-embossed title on the cover. Viewed under ultraviolet light, however, the words and images magically appear. It’s a neat idea, but it must drive printers nuts to press check.