Rainbow on Mars by Devon Healey Rainbow on Mars has a visual poster and an audio poster. The audio poster is a standalone piece that also serves as an image description of the visual poster. LISTEN Stream the audio poster. Download the audio poster. OutsidetheMarch · Rainbow on Mars Audio Poster READ Review a PDF transcript of the audio poster. CREDITS Written by Devon Healey Conceived and produced by Griffin McInnes Sound design by Heidi Chan Music by Heidi Chan with Malia Rogers Voiced by Devon Healey and Vanessa Smythe