From Interweave Knits, Holiday 2010:

“Intarsia creates unbroken areas of single colors; a new method for intarsia in the round does so without seams or fussy workarounds. Anne Berk’s Pinwheel Beret is an exercise in cutting-edge knitting. … The knitting is worked flat in stockinette stitch and the rows are joined seamlessly by twisting the yarns to form an interlock as with standard intarsia.”

Calls for 1 skein each of four different colors.