There’s a reason for that it is called synthesia.
Synesthesia is a condition that joins objects such
as letters, shapes, numbers or people’s names with
a sensory perception such as smell, color or flavor.
This condition is voluntary it can not be forced.
There are many types of Synesthesia. The most
common types of synthesia are:
1. Lexical-gustatory Synesthesia.
2. Mirror-touch Synesthesia
3. Personification
4. Number-form Synesthesia
5. Chromesthesia.