Sidney's own title inscribed at the lower margin: "Aurora Landscape" — confirmed in both the painting and the spreadsheet. Aurora, Colorado is a city immediately east of Denver, and this small but atmospherically rich watercolor places Sidney painting close to home.
At 6.75" × 4.75", this is one of the smallest works in the collection — barely larger than an index card — yet it contains one of Sidney's most dramatic sky treatments. The composition is essentially all sky: above a thin strip of rolling green-and-yellow earth at the bottom, the sky fills the upper three-quarters of the painting with a turbulent mass of clouds — dark graphite-gray at upper left and right, luminous white-gold at center where light breaks through, warm pink-orange and brown passages where cloud edges catch the light, and bursts of orange and yellow at the right center suggesting either breaking sun or lightning in the distance.
The sky in Aurora Landscape is among the most meteorologically specific in the collection — this looks like a Colorado afternoon thunderstorm from below, the kind of sky that rolls in fast from the mountains across the Front Range. The dark gray masses, the yellow-white light at center, the warm passages of lit cloud edge — these are the visual facts of a specific kind of weather in a specific place.
The earth below is handled with characteristic economy: a thin band of green-yellow fields with the dotted dark marks of trees, and that is all. The sky is everything. Sidney was standing in Aurora, Colorado, looking up.