Mexico's Javier and Efren orchestrate an orange centrifugal illusion for the design of these rock glasses. Each glass is crafted with traditional blown glass techniques, in which artisans blow through a metal pipe while twirling it with one hand. They simultaneously shape the molten glass at the other end, expertly achieving a colorful effect. Because each piece is handmade, shape and size can vary slightly and tiny bubbles may appear within the glass. This exemplifies the hand-blown technique, making every piece a unique example of blown glass craftsmanship.