Until today, I had never heard of it:

Introduced in electron microscopy by Hegerl and Hoppe in the early 1970s, “ptychography” (pronounced “tikography,” I think) is an imaging technique that combines diffraction data from multiple datasets obtained by scanning a finite illumination on an extended specimen.

It helps know we’re talking about x-rays, and that among the uses researchers forsee for such imaging processes are more detailed 3D images of human bodies.

Even on such short acquaintance, though, ptychography seems like a really good example of the idea that “measurement,” can’t be separated from the one who is measuring, the one who is being measured, and the equipment being used. The knower and the known are clearly, deeply, “entangled” with one another.

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