Reifikations-Fehlschluss (Reification Fallacy)

Anthropomorphisation as a fallacy occurs when human characteristics such as desires, intentions, beliefs, or emotions are attributed to non-human entities — animals, algorithms, corporations, natural phenomena — and these attributed qualities are then used as the basis for reasoning or argumentation. While anthropomorphic language can be a useful heuristic, it becomes fallacious when the projected human qualities are treated as literal truths that drive conclusions.

The pathetic fallacy, a term coined by John Ruskin, occurs when human emotions are projected onto nature, weather, or inanimate objects, and these projections are then used to support conclusions or interpretations. While common and often harmless in literature, it becomes fallacious in argumentation when the emotional state of natural phenomena is treated as evidence for a claim about the world or human affairs.

The ontological fallacy occurs when a model, map, theory, or abstraction is confused with the reality it represents. Conclusions are drawn as if the properties, limitations, and structure of the representation are properties of the thing itself. This is a fundamental category error: the model is an epistemological tool, not an ontological entity, and reasoning that collapses this distinction produces invalid inferences.

The semiotic fallacy occurs when the sign (word, symbol, label, metric) is confused with its referent — the actual thing it represents. This is the argumentative form of Korzybski's famous dictum that 'the map is not the territory.' The fallacy manifests when properties of the representation are attributed to reality, or when manipulating the sign is treated as equivalent to changing the underlying reality.

The mereological fallacy involves a confusion between the properties of parts and the properties of wholes, but differs from the simpler composition and division fallacies in that it involves a category error about what kind of entity can possess a given property. While composition/division involve incorrect inferences about the same type of property at different levels, the mereological fallacy attributes properties to entities at a level where those properties are conceptually inapplicable — as when neuroscientists say 'the brain decides' or 'the hippocampus remembers,' attributing person-level psychological predicates to sub-personal components.

The teleological fallacy occurs when purpose, design, or intentionality is attributed to a process, system, or entity without evidence that such purpose exists, and this assumed purpose is then used as a basis for reasoning. While teleological language can be a useful shorthand in biology ('the heart exists to pump blood'), it becomes fallacious when the attribution of purpose is taken literally and used to derive normative or causal conclusions — especially in domains like evolution, history, or economics where no intentional design has been demonstrated.