When dropping some books off at the library, I noticed the morning light shining on the First Parish Church and snapped a couple photos. As usual, I printed two copies of my reference photos: one in color and one in black & white. In the color photo, the shadow side of the building appeared to be almost exactly the same value as the sky. However, in my black & white photo, the building was actually a few shades darker. Having that black & white reference is very helpful as it is often difficult to determine the subtle value changes in a color reference.