There was one winter night driving up to the cottage before our daughter was born, when the lights started right around Orillia as we drove straight North up Hwy 11. The green and blue "curtains" rippled and flashed for more than 40 minutes, completely filling the front window of the car. My husband finally pulled over in a safe spot because the lights were so distracting. They made a kind of tinkling glass sound. That was the most spectacular display I've ever seen because it filled the whole northern sky. But I've never been further north than Timmins.