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In observer-centric spatial perception, the same scene may be expressed under different local observer frames while its structure remains unchanged. However, existing models typically assume a fixed scene-aligned reference frame and may produce semantically inconsistent predictions when the scene is re-expressed in another observer frame. We attribute this failure to the heterogeneous frame dependency of relational predicates. Directional predicates such as $\\textit{left}$, $\\textit{front}$, $\\textit{right}$, and $\\textit{behind}$ are $\\textbf{Observer-Dependent Relations}$, whereas most contact, support, and semantic predicates, such as $\\textit{standing on}$ and $\\textit{attached to}$, are approximately $\\textbf{Observer-Independent Relations}$. 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Directional predicates such as $\\textit{left}$, $\\textit{front}$, $\\textit{right}$, and $\\textit{behind}$ are $\\textbf{Observer-Dependent Relations}$, whereas most contact, support, and semantic predicates, such as $\\textit{standing on}$ and $\\textit{attached to}$, are approximately $\\textbf{Observer-Independent Relations}$. 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