"Some people experience the world in a unique way - a dog's bark might taste like chocolate or a piece of music appear colourful.
This is because they have a trait known as synaesthesia. When one of their senses is stimulated, another sense is activated at the same time.
A new garden design is helping people without the trait to imagine what this would be like.
Claudia Hammond [from the BBC], who has a mild version of synaesthesia, went to find out more."
From the BBC Health magazine.