SolaColor is a scheme for creating a place (namely, a floor space) whose color is varied in response to sunlight. The aim of this work is to create sustainable spatial rendition by utilizing sunlight. A feature of this spatial-rendition scheme is rendering places by color - rather than contrast - of lighting. By means of SolaColor, areas in sunlight are colored in pink, while shaded areas are colored white. When this scheme is practically applied, time-varying patterns appear in synchronization with the movement of the sun. When a person or object enters a space created by SolaColor, white shadows oriented according to the position of the sun are formed in the manner of a sundial. The scheme can be implemented by utilizing photochromic material and optical design, and it can be introduced in any location under sunlight without the need for an electrical-power supply.