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For a set of Wang tiles $\\mathcal{B}$, spatial chaos occurs when the spatial entropy $h(\\mathcal{B})$ is positive. $\\mathcal{B}$ is called a minimal cycle generator if $\\mathcal{P}(\\mathcal{B})\\neq\\emptyset$ and $\\mathcal{P}(\\mathcal{B}')=\\emptyset$ whenever $\\mathcal{B}'\\subsetneqq \\mathcal{B}$, where $\\mathcal{P}(\\mathcal{B})$ is the set of all periodic patterns on $\\mathbb{Z}^{2}$ generated by $\\mathcal{B}$. 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