Begun in 1955, the quinquennial art festival, Documenta, in Kassel, sprawls across the small German city in venues large and small, some easy to find and some, more challenging. Documenta 14, this year’s version, involves multitudes of artists and two cities, Kassel, Germany and Athens, Greece. The curatorial theme is displacement, dispossession, power, colonialism and restitution. Some art lovers feel that theme personally, as they struggle to find the art, get lost and experience their own lack of power. Roberta visited and reports.