Interior Space and Exhibition Design Mountain Rock Comfy Home Residence by Xu Xu Interior design co., Ltd. Mountain Rock Comfy Home is a residential interior design for a 133 square meter home in Taichung, Taiwan. The original four rooms were rearranged into three rooms for two people. One room was divided into two areas to enlarge the kitchen and the dressing room. Removing redundant space creates a wider and cozier interior. The space is finished with F1 class low-formaldehyde wood materials, which emit less formaldehyde than the F3 class accepted in Asia. Eco-friendly latex and mineral paints help decompose formaldehyde, and an air circulation unit maintains indoor air quality.