Crayons are more than just a coloring tool—they’re a product of careful design and manufacturing. In factories, raw materials like wax and pigments are blended, melted, and poured into molds.

Firehouse Art Center: “Happy Sad,” new work by Kenzie Sitterud, up through Sunday; 667 Fourth Ave., Longmont; firehouseart.org. The Great Frame Up: Longmont Artists’ Guild Member Show ...