多选题 In "No Signposts in the Sea", the author uses a variety of color words which convey symbolic meanings. For example, "we rounded just a cape towards sunset,…, a great purple mountain overhung by a great purple cloud. The sea had turned to a corresponding dusk of lavender. Aloof on the top, the yellow light revolved, steady, warning." The purple color gives people a feeling of _______ just as Edmund wonders "what mortal controlled it." But the yellow light offers people direction in the __________