Examination of the phrase 'to write on a wall' as both 'to write about a wall' and 'to write on top of a wall'. Extended into 'to build on a wall' as both 'to build on top of a wall' and 'to build about a wall', as well as on the phrase 'to write or build on a text' understood in all its combinations.
In analogy to pure language understood as the communication of communicability, the film suggests a pure architecture as the building of buildability – and with regard to research – documenting as the documentation of documentability.