A very small hologram that can be used across all different wavelengths of light and can be programmed with different images based on the direction of light that works because it's made from a material that doesn't absorb certain light and has other properties not found in nature.
A very small hologram that can be used across all different wavelengths of light and can be programmed with different images based on the direction of light that works because it's made from a material that doesn't absorb certain light and has other properties not found in nature.