"The idea is to make it permeable by people, " Govan says, even if those people can peer in without buying a ticket.

WSJ: Michael Govan, the Man Behind LACMA | WSJ. Magazine May 2013

Mr. PILLER: Only in recent years did they figure out how to get the gas out of the shale, which is a less permeable rock.

NPR: Drilling for Gas in Dallas-Fort Worth