The Mud Zone at the Minnesota Children's Museum is exactly what it sounds like.
An outside portion of the St. Paul museum has two giant bins filled with dirt, vessels like pie tins and bowls and spigots for water. Next to it sit two stations with rolling pins, cookie cutters and some sinks, all of which are caked in mud by mid-day.
Parents may not like the sound of the messy fun, but kids seem to love it. And museum officials say making mud pies has a host of benefits.
"Playing with mud is surprisingly educational," said Bob Ingrassia, vice president of external relations at the museum. "It's very sensory, obviously, and there's a lot of thinking going on."

Ingrassia said the museum team met with engineering students at the University of St. Thomas to design the special area, complete with mud "flingers," where kids can toss mudballs at plastic "monsters."
Getting the mud mix just right was essential, said Ingrassia. "Kids and adults notice this right away: You have to get the consistency of the mud right."
The museum goes through about 1.5 cubic yards of general, all-purpose topsoil a week.
Jessica Turgeon, director of experiences at the museum, oversaw the St. Thomas student research team's painstaking effort to make sure the dirt was perfect for kids to play in.