
Paint-on-glass animation is a frame-by-frame animation technique in which an artist manipulates wet media (typically oil paint, gouache, or acrylics kept workable with additives) directly on panes of glass placed under a camera. Each incremental change is photographed, creating fluid, painterly motion when played back.
Because the artwork is reworked continuously on the same surface (often on multiple layers of glass for depth), the results feature dissolving shapes, smudged transitions, and rich color blending that are difficult to achieve with cels or digital tools. The method is slow and highly artisanal, but prized for its dreamlike, impressionistic look.