They’ve been imprisoned, tortured and spied upon. Now dissidents from Europe’s last dictatorship are bringing the sights, sounds, smells and even tastes of brutal repression to the world’s biggest festival of art In a studio down a residential road in west Warsaw, a group of former political prisoners are cutting golden stems of wheat to 90cm lengths and stacking them, ready to be shipped to the Venice Biennale. A giant ball made of books banned in the neighb... [10596 chars]