In this project, we progress the development of the molecular robots by using the volume expansion and/or contraction with the change of color and the educational tool for young students by utilizing the structural color materials. Accordingly, this article constitute of the two independent themes related with the structural color. At first, we found the first evidence for the bidirectional photo-mobility revealed by the use of difference of chemical properties in the diamine derivatives. Secondary, we improve the fabrication method of HPC solution, which can maintain the structural color for three months.