In response to last week's column about the origin and meaning of the Magen David, Gershon Seif wrote:

I recall learning that the two triangles represent the reciprocal relationship that the Jewish people have with Hashem in bringing blessing to the world. The triangle pointing up stands for our Mitzvot. They go up to Heaven, then they activate a flow of good to the world from Heaven back down to the world, which the triangle pointing down stands for.