Korean object design studio Hattern, has designed the mellow collection as a vase that can be harmonized with plants. Mellow collection is an object and living product that expresses a variety of situations that stimulate the sense of optic, which is one of the senses that responds to the light. It was designed with inspiration from Art Print Impressionism in the late 19th century and expressed minimalist interpretation of techniques used by Impressionist painters such as the Color Split method. There are two versions of Mellow collection. Both versions with blurred finish and transparent finish make them feel differently. Expression of color through gradation expresses various tone changes of color, and refraction of light causes the color feeling to diffuse, or it gives a unique reflection effect. The Mellow Collection is made by dyeing the inside of the acrylic block using 6 primary colors.