Brussels - The Czech EU presidency Tuesday cloaked a segment in a controversial art installation in Brussels which portrays Bulgaria as a psychedelic Turkish squat toilet.

Security officials confirmed that the display of Bulgaria was covered up over night, after the portrayal had provoked outrage in Sofia.

The eight-tonne piece entitled "Entropa" by controversial Czech conceptual artist David Cerny which pokes fun at national sore points and stereotypes, resembles a plastic scale model kit of an EU map. It is installed at a Brussels building where EU summits take place.

The Czech EU presidency had apologized immediately after the presentation was first shown to its EU partners last week. Bulgaria had formally complained and demanded the removal of the segment.

Slovakia had also protested for being depicted as a Hungarian salami but was satisfied with an apology.

Cerny, who made his name through provocation, had tricked the government in Prague into believing that "Entropa" was a collaboration by artists representing all 27 member states. (dpa)