The stunning turquoise at Grinnell Lake in Glacier National Park is created from the rock flour accumulated from Grinnell Glacier. Rock flour is very light, and stays suspended in the water. When the light hits the surface the silt distorts the wavelengths of light, reflecting back more of the green and blue end of the spectrum; making beautiful turquoise ripples when a pebble is dropped at its edge. This artwork and pattern was produced as Artist-in-Residence at Glacier National Park.