Solid Geometry 1938, H. Hagens-Knoop Annotated Matte Paper Photo hand-painted brick with minor degrading along left

with minor degrading along left edge

we can assume it was done in the 1880s or so

It appears to have been hand-tinted

and believe it dates to 1925 or so

Solid Geometry 1938, H. Hagens-Knoop Annotated Matte Paper Photo hand-painted brick with minor degrading along leftThe combination of "Solid Geometry 1938" carefully hand written and upper right and the resting of this student's foot against the edge of a desk across the aisle knee and ankle forming two near perfect right angles completely does it for me, the gesture itself an embodiment of the phrase, and the image itself just perfectly composed. It is stamped on the back "H. Hagens Knoop," a photographer I've found just a couple of records for: several photos in