 The study of random organization using a vortex system shows that when a periodic shear with a small amplitude is applied to many particle assemblies with a random distribution, the particles gradually self-organize to avoid future collisions and transform into an organized configuration. This is detected from the time evolution of the voltage, average velocity, that increases towards a steady state value. From subsequent readout measurements of t-dollar using various shear amplitudes, we find that the information of the input shear amplitude d underscore inp is memized in the configuration of the vortex distributions in the transient as well as the steady state, and that it is readable. We also find that the transient vortex configuration formed during random organization is not microscopically homogeneous but consists of disordered and organized regions. This article was authored by M. de Broca, Y. Kawamura, K. Ayanaga, and others.