The Modulor is a system of measurements developed by Swiss architect Le Corbusier in collaboration with André Wogenscky in 1948, published in Le Modulor and followed by Le Modulor 2.
 
It seeks to establish a harmonious scale for architectural and urban design based on the proportions of the human body. Inspired by Leonardo da Vinci's Vitruvian Man and the golden ratio, it combines mathematics and biology to propose measurements that are comfortable, functional and aesthetically pleasing.
 
Le Corbusier began with a standard height of 1.83 metres, or six feet, dividing the body into segments and considering everyday postures and movements. The measurements include 1.13 metres, the navel height of a person standing 1.83 metres tall, and other values derived by multiplication and division using the golden ratio, 1.618. According to Le Corbusier, the resulting numbers help design spaces and objects at a human scale.
 
The two starting measurements are 226 cm, the height of a person with one arm raised, and half that value, 113 cm, the navel height. Repeated multiplication and division by the golden ratio produces the blue series from the first and the red series from the second, each following a Fibonacci-type progression and allowing thousands of harmonious combinations.
 
Le Corbusier used the Modulor in many projects, including Marseille's Unité d'Habitation, applying its proportions to apartments and communal areas to optimise comfort and spatial harmony.