The greatest illusion on Earth

– or how we mistakenly believe that colour exists in the external world

Tickets free and available here


By Prof. Ian Abrahams

This talk will lead to the disconcerting conclusion that whilst you might believe, from your everyday experiences, that colour exists as a property of the external world – that bananas are yellow – this is not, from a scientific perspective, possible. Indeed, it will also argue that there is no means to ascertain that what two individuals experience as yellow is the same and that the only reason we agree that bananas are yellow is because we have been taught to consistently assign the term ‘yellow’ to whatever private colour sensation each of us have when looking at objects that trigger that (possibly) unique colour experience.


Click to read Ian’s Biography