X-radiograph(s) of "Mrs. Gerrish" 

Editor: This is an X-radiograph of "Mrs. Gerrish", by John Greenwood. It's fascinating to see the painting's structure revealed like this. What do you make of the composition in this radiographic view? Curator: Note the radiographic density variations. They articulate the form. The artist's application of materials yields contrasts. Consider the relation of lighter and darker areas to mass and void. What conclusions might we draw about Greenwood's method? Editor: It shows such an interesting tension between revealing and concealing the original artwork. I wonder how this informs our understanding of Greenwood's artistic process? Curator: Precisely. The x-ray is its own medium.