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The pattern formation process in the shrinking gel is studied using a confocal laser scanning microscope. The time evolution of the spatial distribution of polymer network within the gel, as well as that of the shape of the gel, is clarified. These results indicate that the pattern formation process of shrinking gel consists of four stages. In the early stages, the diffusion of solvent plays essential roles to form the membrane on the surface portion of the gel. The mechanical properties of the membrane thus formed prevent the uniform shrinking of the gel and finally pattern is formed in the gel. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]