The second movement of the digital video and musical piece, Harbingers , is called Lakes Not Frozen . The idea for this piece grew from research into subtle indicators of change in our environment, or "harbingers" of climate change, that might lend themselves to artistic work incorporating real world scientific data. Looking for temperature observations from the 19th, 20th, and 21st centuries, and timings for winter freezing, I located a public dataset and identified a lake with a trend for when it first froze between the years 1900-2020. The Lakes Not Frozen movement contain visual elements that express in an abstract way the severity of winters during the period of observation and change over time. In light of the observed trend that cold places are warming faster than warm places, a lake in the Sierras of Northern California serves well to demonstrate subtle shifts in freezing and thawing, and by extension, available water in surrounding lakes and rivers from snow o...