If you’ve ever visit St. Louis and not gone to spend an afternoon at The City Museum, you’ve missed an opportunity to visit one of the strangest, most interesting destinations on the planet. Less a museum than just a strange collection of miscellaneous things, usually made of metal, patched together across multiple-stories, it’s a fascinating and utterly bewildering place to spend time in. Unfortunately some sad news this week about its founder, Bob Cassilly. The artist was killed on Monday in an apparent accident involving a bulldozer on his follow-up to the City Museum, a much larger public art project re-purposing a former cement factory called Cementland. The St. Louis Post-Dispatch has more details about the accident and his work on both projects. Here’s a bit about what investigators have released thus far:

Bruce Gerrie, curator of architecture at the City Museum and Cassilly’s friend for more than four decades, arrived at the accident scene after Cassilly’s death. Gerrie said it appeared the bulldozer had slid off a rocky hill and flipped a few times before landing upright.

“He’s lived on the edge,” Gerrie said. “Bob lived a life of excitement and I’m glad that he didn’t have to suffer from anything. He went out as he was.”