Blue could also mean dark green, violet, black or brown. The ancient Greek word for a light blue, "glaukos", also could mean light green, grey, or yellow. The Greeks imported indigo dye from India, calling it indikon. They used Egyptian blue in the wall paintings of Knossos, in Crete, (2100 BC). It was not one of the four primary colours for Greek painting described by Pliny the Elder (red, yellow, black, and white), but nonetheless it was used as a background colour behind the friezes on Greek temples and to colour the beards of Greek statues. The Romans also imported indigo
Black-and-yellow phainoptila the air, though not often. Usually found alone or pairs, forms loose flocks after breeding season. Call is a high, sharp, thin "tsit" or "tseep", suggesting a much smaller bird. Appears to not sing. The nest is a compact, bulky, cup of green moss, thin stems and fern fronds. Found 5–13 ft. (1.5–4 m) up in a dense shrup or sapling. Lays 2 spotted, greyish-white eggs. Nesting occurs from April to May. Black-and-yellow phainoptila The black-and-yellow phainoptila or black-and-yellow silky-flycatcher ("Phainoptila melanoxantha") is a species of bird in the family Ptiliogonatidae. It is monotypic within the genus Phainoptila. It is