This prickly piece is Deer by Polish artist Natalia Bazowska, and can be seen at the 7th Moscow International Biennale of Contemporary Art in the Russian capital.

The biennale was set to begin yesterday with the New Tretyakov Gallery as the principal venue, according to the official website.

The curator is Yuko Hasegawa, artistic director of the Museum of Contemporary Art, Tokyo, and a professor of Tokyo University of the Arts.

The biennale's Main Project presents 52 artists from 25 countries, and features 155 works by artists such as Matthew Barney, Olafur Eliasson and Bjork.

The project Clouds Forests focuses on a new eco-system formed through a circulation of "Cloud Tribes", who were born in the Internet cloud space, and "Forest Tribes", whose origins are cultural.

For the first time, the biennale will last four months.

Another first for the event is a free iOS- and Android-friendly mobile app which comes with a guide- enhanced map covering all venues and exhibitions of the biennale and a guided tour of the Main Project, featuring the exhibition plan and list of the works of art.

Apart from the exhibitions, the biennale features meetings with artists, lectures, discussions and a children's programme.