I think this is a bellflower (Campanula spp.), perhaps the common garden bellflower (C. rapunculoides). Photo taken on the morning of the 12th; note the “hairs” on the petal margins.
We’re very much enjoying the dramatic effects of early-day and late-day horizontal light.
I take it as a very good sign that a flat-bed duallie (never seen it spelled out) delivered shingles and Stuff (including nails and roofing paper) this afternoon.