Golfvirta animaationa

https://www.youtube.com/watch?v=LkRQjTdTvFE

https://www.youtube.com/watch?v=6vgvTeuoDWY&ebc=ANyPxKpby-BYCdu9YFwMJEwVcGSI_wYL7rXkQVpFsgYrLfUJH6-W7Jr6mDrlC3QYIKnNd8WJwmwpJqJKZf-6F3w3xDXxytNOgw