However, fans werent impressed by the 51-year-old artists choice ofwearing shadesthroughout theBBCtalk show.
Others wear them to reduce eye strain from screens or fluorescent lighting, or for confidence and privacy.
In some cases, its simply a personal style choice or a way to maintain a signature look.
It is unclear whether Pharrell had a reason behindwearing the sunglasses.
Some viewers took to social media to express theirviews about his fashion move.
Why is he wearing sunglasses indoors?
I love Pharrell, but take your sunglasses off #GrahamNortonShow, read a second comment.
(Unless he has some medical reason), one said.
Why is Pharrell wearing sunglasses?
I know hes cool but like!
This is the way you respond to senses, or your senses work slightly differently?
Graham asked the musician during the show.
Precisely, Pharrell responded.
So the most popular one is sound to colour.
But theres all types of synesthesia out there in the world.
