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.
A shower stall should be a comfortable size for the average person. Practical minimum is 36 inches x 30 inches without a door. Anyone taller than 6 feet would probably not be comfortable with a smaller stall. Toilet stalls for public use in the USA are usually governed by the International Plumbing Code.