The kayon figure is a traditional artefact in the shadow puppet form, which has features in its shape, so this figure is often utilized as the basis for a branding design to give an Indonesian identity. However, the kayon shape does not have enough explanation to be recognized as a geometric shape. This makes some people have an ethnocentric stigma against this figure utilizes. This research aims to explain the kayon shape using mathematical aesthetics to obtain objective results. The golden ratio with experimental methods is the theory to analyze the kayon shape. The structure and size data of kayon shapes were obtained from observing 25 kayon figure artefacts of Surakarta-style shadow puppets. The main structure of the kayon figure consists of the pucukan (the top part), the genukan-lengkeh (the middle part), and the palemahan (the bottom part). The kayon shape size ratio guide is obtained from the phi value in the golden ratio number pair with the formula φ1
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