LOS ANGELES (CBSLA) – Someone’s been leaving small metal sculptures in a park in Madison, Wisconsin, for years. But finally, the mystery has been solved.

For the past four years, high school senior Milo Wenc has been on a mission inspired by a pyramid in wooded Hoyt Park. With stone faces and elaborate designs carved into one side, the pyramid itself has long been a mystery to many who frequent the space.

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“There’s a lot of mystery about where it came from and I wanted to add to that and give people an experience of finding these things here,” Wenc tells CBS affiliate WISC.

Fascinated by the clash of nature and mechanical objects, Wenc put his artistic talents to work.

“I want to tell a story with them. I want people to imagine where they came from and make up their own story about them,” he says.

Wenc first started making his sculptures out of clay as a freshman. As a senior, he uses scrap metal his dad brings home.

“I get pieces that have already had a story and have already been used in a different context, like within someone’s apartment like a piece of a sink or electrical parts of a wall,” he explains. “Then I’ll give them a new story and a new character.”

Wenc drops off sculptures at Hoyt Park several times a month to keep interest up. Sometimes, he walks through the area to listen to what others are saying about them without revealing himself.

“Seeing what people think about them and get people’s different reactions to them. Just knowing how I’ve made an impact on people’s lives even if sometimes they don’t even know it,” he confides.

Wenc graduates from high school this year and says he wanted to reveal himself before going off to college out of state. He says he’ll probably still make metal sculptures and put them on the pyramid whenever he comes to visit.

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“I like a mystery and I like telling a story,” he says.