The Washburn Review • January 21, 2016 • https://washburnreview.org/7489/arts-entertainment/non-objective-opens-at-mulvane-art-museum/attachment/timothy-apps-constancy-is-supposed-to-convey-images-of-moving-forward-and-the-light-and-dark-juxtaposition-creates-an-interesting-optical-illusion/