Where does legibility collide?

In typography and the psychology of reading, legibility is the ease and speed with which printed characters and text can be recognised and read, a function of type form, size, spacing, and contrast. Tinker and Paterson's 1928 Influence of type form on speed of reading ran controlled reading-speed experiments showing that typographic choices measurably help or hinder reading. The referent is a measurable property of set text for the reader, unrelated to how readable a city is to its inhabitants or a society is to its government, beyond the shared root meaning of being easy to make out.[1]

Unit

Reading speed and recognition accuracy for set text

Recovery means

Not applicable

Measured by

Tested experimentally by reading speed, perceptibility at distance, and error or eye-movement rates across type variables

In urban design, legibility (closely tied to Lynch's "imageability") is the degree to which a city's physical form can be read and organised into a coherent mental image, so people can recognise its parts and grasp how they fit together. Kevin Lynch's The Image of the City built this from residents' mental maps and named the elements (paths, edges, districts, nodes, and landmarks) that make a place legible. The referent is the readability of built urban form to its inhabitants, a different construct from the legibility of printed type or of a population to its state.[2]

Unit

The degree to which a city's form resolves into a clear, shared mental image

Recovery means

Not applicable

Measured by

Elicited through residents' sketch maps and interviews, coded into paths, edges, districts, nodes, and landmarks

In political science and anthropology, legibility is the way a state makes a complex society measurable and governable (through cadastral maps, standard surnames, uniform weights, and censuses) so that populations and land can be seen, taxed, and administered from the centre. James Scott's Seeing Like a State argues that such imposed legibility often flattens local knowledge and produces failure when schemes ignore what they cannot measure. The referent is the administrative readability of a society to its rulers, distinct from the readability of a printed page or a city's layout.[3]

Unit

The extent to which a population and territory are rendered countable and administrable by the state

Recovery means

Not applicable

Measured by

Read from state instruments (cadasters, censuses, standardized names and units) that render people and land countable