1.

Speaking in a visual metaphor: an observer is "blind" when he cannot make distinctions. He then perceives nothing or only homogeneity - or, to put it graphically, he sees only black night - quite independently of whether and what could be seen. In this case, all nerve cells of the retina of the observersystem are in the same state. The observer's own state, not the environment of the observer, is homogeneous. I can perform this operation by closing my eyes.

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2.

G. Spencer-Brown writes: "Discrimination is perfect content" (LoF: 1). I will come back to possible interpretations later. Here just so much: To distinguish also means to create a space in which the distinction is made.

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3.

G. Spencer-Brown writes: "Let any mark (..) be taken as a signal. Name the use of the signal its purpose" (LoF: 3).

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4.

G. Spencer-Brown uses the term "construction" as a heading to his basic postulate of the beginning "Make a distinction" (LoF: 3).

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5.

D. Krieger begins his introduction to general systems theory by suggesting that we put ourselves in God's place and make the world through discernment. Unfortunately, he does not say where God sits and how to make something by discernment.

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