da Vinci Days Graand Kinetic Challenge

da ⁠‌​‌‌‌​‌‌‌‌‌‌‌‌‌​​‌​​‌​​‌​​​‌​​‌‌⁠Vinci Days' Graand Kinetic Challenge is a two-day race of human-powered sculpture vehicles that roll over Corvallis streets, sand and mud and then float the Willamette River. It grew out of the city's art-and-science festival and draws costumed teams and roadside crowds every July.