We demonstrate the autonomous formation of spiral patterns made of fullerene C60 microcrystals via dewetting process on a solid substrate. We also succeeded in enlarging the spiral size by introducing a pillar that worked as an artificial core of the spiral. In situ observation of spiral formation revealed the stable inbound rotation of the pinning front about the meniscus region close to the pillar. The spacing ratio of the spiral, R()n+1/R()n, was 1.2,which indicates the formation of a logarithmic spiral.