Van Hise Rock was named for the preeminent geologist of the 19th century, Charles Richard VanHise, who was also president of the University of Wisconsin-Madison from 1903-1918. VanHise used this rock to show the major structural features of metamorphic* Precambrian* rock and also to demonstrate the kinds of changes that occur in rocks through mountain building periods.
The requirement for seat height, however, is very simple: The top of the seat must be a minimum of 17 inches and a maximum of 19 inches above the shower floor.
Code Minimums. The International Residential Code requires shower stalls in homes to measure a minimum of 30 inches by 30 inches. Keep in mind that this is clear space minus any seats or obstructions -- so if you add a 15-inch-deep seat, your shower must measure at least 45 inches deep by 30 inches wide.