We designed the space and installation art for the Prussian Blue Device Exhibition, an exhibition connecting Japanese art and design, which shows the latest Japanese patent technology. Prussian blue device changes its color gradually from blue to colorless by external stimulation, such as electricity. We made the blocks to show the molecular structure and devices that change their color by a switch, to show how to work these devices. These exhibits were arranged on the top of fixtures of steel rod made up in a lattice pattern, which imitated the molecular structure of that device. We also made a 2m cubic display as an installation to show technical possibility through change of that color.