In Latvian lore, not much is remembered of Austra—the goddess whose sister-selves include the other Dawn goddesses of the Indo-European diaspora: Ushas, Eos, Aurora, Ostara, Easter, among others—except for her name and her symbol.
Each of the Old Gods of the Baltic pantheon is associated with a particular sigil that has been faithfully transmitted through folk-art—in particular weaving and embroidery—down to our own day. Saule (Sun) has a sun-wheel, Mēness (Moon) a crescent, Pērkons (Thunder) the thunder-cross (fylfot), and the like (Dzērvītis112ff.).
Since Austra, by her very nature, does not readily lend herself to depiction—how does one draw a picture of light, of color?—her symbol is Austras koks, “Austra's tree.” This makes eminent sense, since trees capture both the first and last light of the day, even when the Sun is not yet (or is no longer) above the horizon. In Latvian lore Austra's tree is said to have copper roots, silver leaves, and golden branches (Dzērvītis 115).
Read figuratively, this describes the colors of the great Tree of the East as it shines with the new light of dawn. Read literally, the image may sound to the modern ear both artificial and unnatural. But to the ancestors, for whom the natural was commonplace and artifice precious, the image would have expressed the transformation of the everyday into the extraordinary.