"We make vessels every day, and I oftentimes wonder where they are all going," he said in a moment of reflection at his Santa Ana studio. "Hopefully, they have all found happy homes."
Happy homes all over the world, as one recent order confirmed. It started with an unusual phone call from the Office of the Chief of Protocol at the U.S. State Department. A representative had seen Siemon's work on display at the Smithsonian's Renwick Gallery in Washington, D.C., and was looking for distinctive gifts for foreign dignitaries.
Siemon sent some images and went back to his furnace. The State Department soon got back in touch to say "Michelle" was quite pleased with the work.
"I thought, 'Wait a minute, you're not talking about Michelle Obama?' " he said. "I was almost speechless. The fact that the first lady was looking at images of my vessels -- it was really a neat moment for me."
The Obamas gave Siemon's glass to heads of state during the couple's first trip to Europe last spring.
"I don't know who they were given to," he said. "Those are the kind of specifics that I didn't push and they didn't reveal, and I was just honored."
A couple of months later, the State Department called again with another request. It wanted a batch of handblown honey pots.
"The first lady has been keeping bees, apparently, in the White House garden," Siemon said. "It was getting close to harvest time, and they were looking for some unique containers."
Glass pulled from the furnace looks and moves much like honey. Even the color, still glowing from the heat, is similar, Siemon said. He designed a simple, elegant vessel that showcased both the material and its contents. "We were inspired by the way the honey flows and the way the glass flows," he said.
The White House honey pots were part of a tea set that Michelle Obama gave to the other first ladies at the G-20 summit in Pittsburgh in September. When State Department officials called Siemon's design the FLOTUS gift, he wondered, "Should I know what that means?" Only later did he learn the Beltway acronym for the First Lady of the United States.
Larry Schaffer, owner of the L.A. design store OK on 3rd Street, has long sold Siemon's glass. Schaffer sees the artist as part of a new generation of Americans with a respect for traditional technique.
"So much of the craft movement is wacky teapots and feathered masks and horrible stuff, and yet there are these people like Caleb who are really honing in and have a refined sophistication," he said. "Caleb is looking back toward the more tight, more beautiful glass, not just letting glass do what it's going to do. He has learned this range of techniques and combines them in a unique and personal way."
Siemon found his calling at a summer art camp during high school, majored in glass at the Rhode Island School of Design and later threw himself into a two-year apprenticeship with Pino Signoretto, an Italian master on the island of Murano.
He considers his exchanges with the White House to be one of the high points of his career.
"As a craftsperson, the ultimate compliment is if your craft can represent your country," he said. "There's no plans of visiting the White House," he said. "But I do want to taste that honey."