If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out intricate patterns using the pens and gears of a Spirograph kit. Simple as those parts may be, they’re actually a very ...

Tim Reade doesn’t know exactly when his parents bought the print he recently brought to the Michigan Design Center for an appraisal. “Maybe sometime in the 1970s or ’80s,” he explained to appraiser ...