Like many authors from the enlightenment, August Strindberg was generally interested in scientific research and contemporary experimental practices. The question if and how these practices also influenced his writings has been discussed widely in connection with themes and forms of his naturalistic dramas. The first part of the article uses the corresponding insights in order to profile Strindberg’s very specific performative use of literary experimental practices. The second part takes a look at Strindberg’s late writings where the literary experiment comes to expression as a specific form of writing-practice. Especially the complex media-technical apparatus that Strindberg uses in order to write his Occult Diary can be used to illustrate this specific form of artificial experiment. Surprisingly, it is just a text that was often connected to irrational thinking and even medieval traditions that bears clear traces of similar ‘scientific inspired‘ wri-ting-experiments that were established during the age of enlightenment.