(See http://mitworld.mit.edu/video/115 , unless you are using an iPad, in which case it won't work, of course, thanks to Apple's unforgivable contempt for its customers and their wishes.)
In any case, while I watched some of his reading, and did this quick sketch of him, with pastels on dark-blue background.
I've learned that (1) one can't use fixative on pastels and expect the colors to remain vibrant; and (2) it is hard to convey the colors via a digital flash photo, as the photographing somehow only reflects the brighter colors, and loses the darker ones. -or at least I don't know how to do it.
The size of this picture is approx. 25 x 35 cm, (japanese "B4" size).