Relief

Take the receding plane out, and see what stands off the ground.

• A painter's device, like squinting, flipping the canvas, or the black mirror: it hides one thing so another shows.
• Depth is the raw reading: mostly a ramp from near to far. Relief takes each part's own surround away, so what is left is what stands forward of it.
• Stands out keeps those shapes in colour and lets the rest fall back.
• Hold anywhere on the picture to see the photo.

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The depth reader (about 50 MB) downloads once, then stays on this device. Pictures never leave it.