A Lexicon of Basic Concepts. In: Vilém Flusser, Towards a Philosophy of Photografie, Reaktion Books 2000, 83-85.

Apparatus (pl. -es): a plaything or game that simulates thought [trans. An overarching term for a non-human agency, e.g. the camera, the computer and the 'apparatus' of the State or of the market]; organization or system that enables something to function.
Automatic machine: an apparatus that has to obey an arbitrary program.
Code: a sign system arranged in a regular pattern.
Concept: a constitutive element of a text.
Conceptualization: a specific ability to create texts and to decode them.
Cultural object:an informed object.
Decode: demonstrate the significance of a symbol.
Entropy: the tendency towards more and more probable states.
Functionary: a person who plays with apparatus and acts as a function of apparatus.
Game: an activity that is an end in itself.
History: the linear progression of translation from ideas into concepts.
Idea: a constitutive element of an image.
Idolatry: the inability to read off ideas from the elements of the image, despite the ability to read these elements themselves; hence: worship of images.
Image: a significant surface on which the elements of the image act in a magic fashion towards one another.
Imagination: the specific ability to produce and to decode images.
Industrial society: a society in which the majority of people work at machines.
Inform: 1. create improbable combinations of elements; 2. imprint them upon objects.
Information: an improbable combination of elements.
Machine: a tool that simulates an organ of the body on the basis of scientific theories.
Magic: a form of existence corresponding to the eternal recurrence of the same.
Memory: information store.
Object: a thing standing in our way.
Photograph: a flyer-like image created and distributed by apparatus.
Photographer: a person who attempts to place, within the image, information that is not predicted within the program of the camera.
Plaything: an object in the service of a game.
Post-history: the translation of concepts back into ideas.
Post-industrial society: a society in which the majority of people are occupied in the tertiary sector.
Primary and secondary sector: the areas of activity in which objects are produced and informed.
Production: the transfer of a thing from nature into culture.
Program: a combination game with clear and distinct elements [trans. A term whose associations include computer programs, hence the us spelling].
Reality: what we run up against on our journey towards death; hence: what we are interested in.
Redundancy: repetition of information; hence: the probable.
Rites: actions corresponding to the magic form of existence.
Sign: a phenomenon that signifies another.
Significance: the aim of signs.
State of things: a scenario in which what is significant are the relationships between things and not things themselves.
Symbol: a sign consciously or unconsciously agreed upon.
Symptom: a sign brought about by its significance.
Technical image: a technological or mechanical image created by apparatus.
Tertiary sector: the area of activity in which information is created.
Text: series of written signs.
Textolatry: the inability to read off concepts from the written signs of a text, despite the ability to read these written signs; hence: worship of the text.
Tool: a simulation of an organ of the body in the service of work.
Translation: switching over from one code to another; hence: jumping from one universe into another.
Universe: 1. the totality of combinations of a code; 2. the totality of significations of a code.
Valuable: something that is as it is supposed to be [trans. able to be filled with value].
Work: the activity that produces and informs objects.