Your world is different from a pigeon’s – but a new theory explains how we can still live in the same reality
- Written by Catherine Legg, Senior Lecturer in Philosophy, Deakin University
Edijs K/ShutterstockThe human eye registers three colours of light: red, green and blue. But pigeons (and many other animal species) can also see a fourth colour, ultraviolet.
The “four-dimensional” colour space pigeons see may contain millions more colours than ours. To a pigeon, for example, many flowers show patterns that are...





