Entrepreneur Aaron Muderick is burying customer-provided items of his making in a Norristown time capsule. The project marks the 25th anniversary of his product, Learning Putty, his take on a classic 1950s, egg-contained, stretchy-substance toy. MarketWatch contained the details.

Muderick described his story on his website.

“For as long as I can remember, I always had a penchant for putty. While I enjoyed the one that immediately comes to most people’s minds, … it left much to be desired,” he wrote.

To improve the forebear, he taught himself both chemistry and physics.

He called the result “Learning Putty,” to distinguish it from the silly version.

Muderick built a firm, Crazy Aaron’s, on the product.

He extended the brand with Land of Dough, his variation of a well-known, canned, distinct-smelling, colorful modeling substance.

Muderick seeks seeking customer-supplied mementos — pictures, testimonial letters, artwork — for his time capsule.

Items should be received by May 10 and can be mailed or dropped off to The Shop @ Crazy Aaron’s, 700 East Main Street, Norristown, Pa., 19401.

The vessel will be opened in 2048, when Crazy Aaron’s turns 50.

“Our 25-year journey has been nothing short of a fidget-filled roller coaster ride,” Muderick said. “We can’t wait to see what the next quarter-century brings.”

More on Learning Putty is at MarketWatch.

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NBC‘s Today Show covers Learning Putty.