This article investigates the universal role of circular and spherical forms in domestic culture through a comprehensive analysis of their physical, cultural, psychological, and philosophical aspects. The research demonstrates that the dominance of these forms is not accidental but stems from energy efficiency related to the physical principles of isoperimetry and surface tension, ergonomic advantages compatible with human biomechanics, and a deep psychological need associated with Carl Jung's "Self" archetype. Conducted using comparative analysis, the study identifies functional, technological, and symbolic similarities of circular forms across African, Asian, European, American, and Oceanian cultures. Particular attention is paid to the cultures of Azerbaijan and other Turkic peoples, where manifestations of circularity as a profound cultural code are analyzed through elements such as the yurt, tandir, sac, armudu glass (pear-shaped glass), and copperware. The article demonstrates how traditional forms are transformed in modern design and technology (Apple Park, smartwatches, user interfaces), confirming the continuing fundamental importance of the circle in human material and spiritual life. Consequently, the circle and sphere are not merely geometric figures but also a unified language of nature, the human psyche, and culture.