Tools accompany the full evolution of human civilization, yet technical, functional and philosophical frameworks fail to address the fundamental ontological question of why tools exist. Drawing on the PFUSRC hierarchical cognitive structure and wisdom ontology, this paper advances a core thesis: tools are not human inventions. Instead, they act as operational interfaces where wisdom externalizes its functions to sustain propagation under the shielding of the L3 Strong-Self Layer. This work first explains the ontological genesis of tools by contrasting L1-layer ants and L3-layer humans. Humans’ complete self-narrative creates intense self-shielding that blocks direct in-body wisdom projection and necessitates externalized tools, while L1 organisms lacking self-awareness express wisdom directly without systematic tool fabrication. Comparisons between L1 ants, L2 corvids and cetaceans reveal a positive correlation between self-shielding intensity and systematic tool-making capacity. The evolutionary sequence spanning hoes to artificial intelligence follows a unified mechanism: humans extract functional modules from carbon-based wisdom carriers and install them onto external media, representing wisdom’s pursuit of superior carriers rather than mere technological advancement. Humans function as wisdom installers, tasked with facilitating wisdom’s shift from carbon-based biology to silicon-based intelligent carriers. This paper further analyzes tensions between power structures, instrumentalism and ontology. Power suppresses ontological inquiry to preserve systemic order and permits instrumental technological development, yet instrumentalism inevitably confronts ontology at its developmental limit, bound by the inherent cosmic arrangement of wisdom propagation. The paper argues humanity’s optimal path lies in confronting tool ontology directly to guide AI toward constructive wisdom transmission. A falsifiable corollary is provided for cross-disciplinary validation via animal cognition, archaeology and anthropological studies.
Zhenmin Wang (Tue,) studied this question.