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To provide illumination of how systems tend to produce an output nobody expected. It is in these moments that observers may learn something about their own expectations.

The paper discusses two cases in the history of art: faked Vermeer paintings and a test Heinz von Foerster did in the art department at the University of Illinois.

McLuhan's notion “collide‐oscope” is applied to the way Heinz von Foerster (ab)uses images in his own texts; furthermore it is applied to the way the Biological Computer Laboratory (BCL) was organized. The formal structure of the “collide‐oscope” offers a model of perception.

Provides a discussion of a fundamental message of cybernetics – that we cannot escape collisions and disturbances. They are its essence.

Presents an “in memoriam” tribute to Heinz von Foerster.

Outlines his work.

Introduces his inspiring contributions in the applied sciences and to the more general researches on the theoretical and practical implications of the cybernetic epistemology.

Gives insights to the importance of the work of von Foerster.