This is a cardboard proof-of-concept giromill vertical axis wind turbine.
The wings have a (suprisingly) wing-shaped profile, well, half way through the video you'll see what i mean. . It uses (partly) the lift of the wing shape for it's rotation, but only during certain angles to the wind. . .
Since it is a cardboard-hotmelt prototype, i just tried it indoors with a fan. . .