An FFGL mixer that shows this layer or the layer below the way a printed lenticular card does: two pictures cut into strips and interleaved under a sheet of cylindrical lenses, with the layer's opacity fader tilting the card. Each lens focuses the eye onto one point of the print, so the card flips square on and flips back at the edge of the viewing zone. A real lens's focus spot shows both pictures near the flip, a print pitch that misses the lens pitch flips in moiré bands that sweep as the card tilts, a close viewer sees the flip travel across the card, and each lens shows one stepped sample of its picture, with the ridges catching the light.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.