Visitors to the new exhibition at the Royal Academy they must be slipped through between two naked models to enter the exhibition. The unusual installation is part of a retrospective of the career of Serbian performance artist Marina Abramović, writes "BBC" (BBC).

There is also a separate entrance for those who are uncomfortable squeezing through the naked performers.

The exhibition otherwise received mixed reviews from critics, The Guardian he called her "vital"But The Times he called her "merciless".

Getting between the two naked performers forces those who bought tickets to "confrontation between nudity and gender, sexuality and desire", said the head of the Royal Academy, Andrea Tarsia.

The unusual performance was first staged in 1977 by Abramović and her then German partner Ulay. completely naked, couples stood close together at the door, forcing visitors to pass between them.

Telegraph critic Alastair Sooke said he was "preoccupied with not stepping on their toes" as he passed between the couples during the new installation in London.

"You don't have to go through the 'bare gates.' There's a bypass, but that's cheating," added Laura Freeman of The Times. "I squeezed in, pulled my stomach in, trying not to step on anyone's toes."

Retrospective covers it Abramović's half-century career. She is the first female artist to have a solo exhibition in the main galleries of the Royal Academy in its 255-year history.