New York City's underground tunnel becomes public therapy couch

A long tunnel deep in one of New York City's underground stations is now the city's most informal therapy couch.

Passengers are invited to write down their thoughts, aspirations, fears and even scribbles on post-it notes.

Matthew Chavez launched the first edition of his project in 2016, following Donald Trump's election as US president.

Although the project is not political, its timing has sparked considerable political commentary.

Chavez has said that the project is not a response to the election, but rather an invitation to express how you feel, whenever you feel it.