Illich's bicycle is the paradigm convivial tool: - Extends human capacity 3-4x - Uses less energy than walking - Doesn't block others' equal use - Self-limiting (creates only demands it can satisfy) **What would bicycle-level AI look like?** This remains an open question for ongoing exploration. Possible criteria: - Extends thinking capacity without replacing it - Requires less cognitive load than doing alone (but not zero) - Doesn't monopolize the epistemic landscape - Self-limiting in scope and application - User remains clearly in control of purpose **This question guides ongoing design work.**