A low-key but fascinating balance of education, edification and good old fun overlooking Lake Calhoun.. In Short Inside this beautifully restored 1920s Tudor mansion, public galleries are teeming with attractive, interactive displays. For the scholarly, the upper reaches hold a library of rare and other texts. Other fun stuff allows you to generate your own electric current, play tunes on an instrument called a theremin and find out why a compass won't always get you out of the woods. Also interesting is the collection of antique and modern medical devices, generators and other contraptions.