Matrox develops and manufactures the Matrox Mystique, Parhelia, G200, G400 and G550. These luminous spots are called "sun dogs" or "parhelia". Originally, Matrox planned to produce the "Parhelia 2" successor, codenamed "Pitou". The parhelia are caused by light rays passing through oriented plate crystals. He also discusses other phenomena related to rainbows&colon; the mysterious "virgae" (rods), halos and parhelia.