Five undulating vertical waves in bold rainbow hues, blue, green, red, orange, and pink, flow in synchronized S-curves across a soft cream background. The rhythmic pattern creates a mesmerizing optical movement with clean lines and flat color, evoking the playful geometric sensibility of mid-century artwork. Printed on smooth white card stock and made to order, artwork on the front, blank inside, envelopes included in every set. A handwritten note that arrives as an independent artist's work.