Pandemic chalk: Back to School

The chalk on our front walk right now is for Back to School night (last night in my neighborhood). The image is loosely based on a photo of botanist Ethel Grace Stiffler Carpenter (1899-1995), from the Smithsonian. The square is greyer than I like, because it's been about four months since we had rain, and the chalk layers start to build up. (I know, I could hose it off.)