never saw it at dawn, but at dusk, it glows a green colour if you stand to the east of it and catch the sun through the foliage. There are many willows like this on the campus. There were many more until the ACT government decided, in all its wisdom and at the urging of NSW, to declare them a noxious pest and cut most of them in the region down. This has led to toxic blooms of blue green algae being commonplace in Lake Burley Griffin which Sullivans Creek, which flows near this tree in the Law faculty, runs into. The willows used to absorb a lot of the nutrient on the inflow creeks and provide shade and habitat. Now the inflows are open to the sunlight and there is nothing to buffer water flow or to uptake nutrients.
Willows had an important place in the maintenance of the artificial environment we created and we then removed them. Go figure.