Metopes and triglyphs

In Greek temples of Doric order, metopes and triglyphs were the alternating decorative elements on the frieze.
Triglyphs were stone tablets decorated with three vertical grooves, while metopes were the portions of smooth wall alternating with the triglyphs.
In the temples of Akragas, these two elements were often blue (triglyphs) and red (metopes).