Glass marbles are part of contemporary art, Stuckenberg said. The two orbs and more were part of a set Stuckenberg was hiding ahead of the "World's Biggest Treasure Hunt" kicking off July 1.

The 13-inch jar of marbles — to be sold April 15 at Hess Auction Group’s Conestoga Auction Co. in Manheim during a catalogued auction of antiques and Americana — has already exceeded its ...