The foil-covered thing in the middle of this image is the spinner. A silicon wafer is centered on the spinner and held in place by vacuum. A glob of SU-8 is poured onto the wafer, as shown here. The wafer is then spun quickly to distribute the SU-8 evenly over the surface. In this and the next image, the brightness inside the spinner has been enhanced to make the features visible.
(Photo by Dr. Aranyosi.)