Movie: in the final instalment of our exclusive video series, Serpentine Gallery director Julia Peyton-Jones reflects on Smiljan Radi?'s use of handmade paper models to design his bulbous pavilion in 2014.

Chilean architect Radi? created a translucent, cylindrical pavilion constructed from thin layers of white fibreglass, reminiscent of papier mache wrapped around a balloon.

"He designed something that, playfully, looked like a doughnut, or an egg," Peyton-Jones says in the movie, which Dezeen filmed at the Serpentine Gallery in London.

Model making was an important part of Radi?'s design process, Peyton-Jones says, recalling a particular model she saw at his studio made from paper Burda sewing patterns.

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"The models he made were key," she says. "There was one model covered in patterns for making dresses, and this became the basis of the pavilion that we then built on the lawn."

Radi?'s pavilion was raised up from the ground by a series of quarry stones. The doughnut-like shape created an open-air courtyard in the centre, which visitors could look down into from balconies.

"We talked about it as a sort of Romeo and Juliet effect," Peyton-Jones says. "You could call across to somebody on the other side. There was a huge sacrificial stone on the lower level, which was a kind of performance spac...