Deborah,

Don't forget consideration for folks in wheelchairs. This can be quite
variable but ranges from about 42 to 52 inches. They may not be a big
part of your visitors, yet, but it is a small statement that your
institution can make. Remember too that this will also be better for
kids, who often seem lost at art museums.  Just a thought.

Joe Ruggiero
Flandrau Science Center
Tucson