From across the room, I thought the quilt was made of log cabin blocks with a pieced black and red vertical sashing. It's a great visual rhythm.
But actually, the whole quilt is made from square courthouse steps blocks with the same patchwork placement, just rotated 90 degrees in alternate columns. Brilliant fool-the-eye effect! Hooray for homespun artists!
You'll note that the black squares are all pieced with their own little logs! The logs are 1/4-3/8", both wools and cottons, as I recall. You can kind of get a sense of the scale by looking at the little hang tag on the left edge in the first photo.