Der “Blaue Reiter” (blue rider) was a German artist collective at the beginning of the 20th century, with probably Wassily Kandinsky as its best known member.
The sculpture in this image was made by German artist Andreas Kuhnlein, who creates all his well known sculpture with a chainsaw. Have a look at his website, it is definitely worth to examine his work. I myself am scheduled to a visit in his workshop today.