Scratch-plate Holograms

[Mike_L]

Light rays reflected from incised arcs produce points of light that appear to emerge from below the reflective surface or converge above it.
Patterns of arcs can be used to create hand-drawn (or machine etched) holograms...




On the vinyl music album of Star Wars: The Force Awakens are patterns that generate holograms of the Millennium Falcon and the enemy Tie-fighters...