This text articulates boundary as the failure of retention. Boundary is not absence, externality, interruption, or limit. These are effects attributed after failure, not its condition. Retention may persist without collapse into disconnection, yet retention does not guarantee itself. Failure does not arise from disconnection. It is not the loss of retention, but the failure of retention itself without transition into another state. Boundary is not independent from time, space, or causality. Time is the retention of irreversibility. Space is the retention of configuration. Causality is the retention of connectivity. Boundary is the failure of retention. These are not domains but structurally aligned conditions. Boundary does not originate, nor is it derived. It is the condition under which retention fails to be retained without collapsing into anything else. This text presents boundary as a structural condition of failure within Kasei-Theory.
Juza Minamikata (Tue,) studied this question.