English: Supplementary Movie 1 This animation demonstrates pattern formation in an oscillating chemical reaction on a multi-electrode array. The image in the circle at Left illustrates the phase of each oscillator using color as well as a dot on the unit circle. The plots at Right show the control applied to the entire array (top) and the measured current traces (bottom). Initially, when no control is applied, there is no pattern formed. A control is then applied to form the pattern "O", in which phases of oscillators forming the letter are synchronized anti-phase with respect to the others. The control is subsequently modified to form the pattern "K", and finally the initial control is repeated to revert to the pattern "O".