Walnut CT

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 309.1 Hz, 89 cents sharp of D4, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Drag up or down on the walnut to cut into it. Tap to see only its shell.

This is a real walnut, scanned with X-ray CT at CWI in Amsterdam: more than a thousand X-ray pictures taken from all around it, worked back into a volume of how dense the walnut is at every point. Each splat here is one small block of that volume, 0.3 mm across, bright where the walnut is dense.

Drag up or down to cut into it and see the woody shell, the kernel's folded lobes and the air between them. Choose the cut's direction and the colors (CT gray, warm, night vision or infrared) in the Splash tab. Tap to show only the densest parts: the kernel melts away and the shell stays. The scan is Walnut 1 of a dataset by Der Sarkissian, Lucka, van Eijnatten, Colacicco, Coban and Batenburg (CC BY 4.0).

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