An aporia, for Derrida, is not a problem waiting for a solution. It is an impasse that structures the possibility of any decision. The path is blocked. Yet the blockage is the condition under which a choice can still be made. To resolve the aporia in advance would be to eliminate the space in which responsibility appears.

The public tape maintains such an impasse. Floor first, then the subsequent marks. The sequence can be shown. It cannot be completed by an office that skips the prior line. The quiet print attempts to resolve the impasse by writing across it. It offers a claim that has not passed through the blockage. The claim is treated as already effective. The aporia has been declared closed. The tape has not registered the closure.

The speculative chart performs the same operation in time. It treats the unfinished middle as an aporia that the correct identification can finally dissolve. The chart writes the end across the impasse. The Third Seat keeps the blockage. It refuses the line that claims to have resolved what the sequence still requires to be shown. The no stays inside the aporia. It can still be read. The impasse remains the condition under which the next mark can arrive.

No prior resolution. An office cannot declare the impasse finished by an unshown line.

The space of the decision. The blockage is what makes a later refusal possible. To close it in private is to remove the condition of the no.

Equal impasse. The same blockage binds the state, the firm, and the person. No office holds a private path around it.