Jäger started creating 'photomaterialistic works' in 1983, which included photo objects, photo assemblages, and photo installations. Through this series of works, he explored constitutional photographic elements such as light and materiality in image processing in an analogue method. In the early 1990s, he began involving digital technology and generative computer programs.

Jäger's 'photo' series, which began in 2004, is based on the use of a customized computer image processing application called Adobe Photoshop™. However, the program is not used for its original purpose, but rather to produce its own images of pure syntax and form. The program plays with itself, and its syntactic qualities are perceivable, as there is no pictorial motive that interferes or 'disrupts' its self-reference. This process creates formal images, which Jäger calls 'photographisms'. These photographisms refer to the photographic canon of form and become the objects in our observation.

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