A semi-naked man dancing at a House Ball
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The world of underground gay house balls

13 February 2014 Last updated at 02:49 GMT

For gay and transgender black and Hispanic people often marginalised by their families or communities, the late-night pageants known as House Balls can be a liberating experience.

The underground parties feature men and women dressing up and dancing in competitions judged on attitude, style and glamour.

Gerard H Gaskin, a photographer who grew up in Trinidad, has spent two decades documenting a scene which combines extravagance and an exploration of gender identity.

He talked to the BBC about his book Legendary: Inside The House Ballroom Scene - and we went along to an event in New York.

Produced by Anna Bressanin

Picture This is a series of video features published every Thursday on the BBC News website which illustrate interviews with authors about their new books.