Charley Harper high res images

While poking around the internet, I came across artwork by Charley Harper, modernist designer and illustrator. Cincinnati's Contemporary Arts Center has a bio on Mr. Harper, along with a few high resolution images of his work you can download. Not to be used commercially, of course, but you might put a bird on your desktop or make yourself a print. I'm a fan, and use my Charley Harper plates almost every day.