A guide to colours that harmonize for Interior Design. Simply place the main colour under the triangle. The arrows indicate suggested colour combinations. This Interior Design Wheel gives home decorators a guide for selecting complementary colours for interior design. Packed in a plastic sleeve for insertion in a 3-ring binder. Measures approximately 8-1/2" x 11".A colour wheel shows primary, secondary and tertiary colours and mixes. The Artists' colour wheel provides a visual method for illustrating and teaching the relationships of one colour to another and the results of colour mixing.