A Color-Related Cryptogram

In preparation for the next post, which will contain the answer, here is a puzzle (from ISCC News #460):

JQARQE MGHY XQZBAQOB JQXX, VBYRCVI,
CI IGHDBEQYI ZYGO NQIACEA IHEI
PB SCYYQBN PCST AG BCYAR IGOB OCVI
GZ VXCEBAI CEN MGH'XX ZQEN ARCA GEB'I
IG RCYN AG SGXGY ARCA MGH'DB KGA
AG HIB ZQDB SYCMGEI. OCMPB, EGA.

In case you are not a cryptogram expert, here is a hint: X stands for L. A second clue: the poet was a mathematics professor at Case Western Reserve University.

Michael H. Brill
Datacolor