The Theory
The theory discusses how the Victorians from the late 19th century decorated their properties with paints that embodied the natural world- bright colors or earthy colors. Colors such as terracotta or ochre may have been painted on an average Victorian’s home. It was done to bring a sense and feeling of the outdoors.
Reminder
In the South, they did this for the exact same reason. The Victorians picked blue as it reminded them of bright blue and crystal-like skies even on a cloudy day. O’Neill did not namecheck the Victorians exactly, but she appears to be in agreement with the overall idea.