A hallucination is a perception in the absence of external stimulus that has qualities of real perception. Hallucinations are vivid, substantial, and are perceived to be located in external objective space.
Construction begins on Poland's tallest tower by Foster + Partners. Work has started on a 310-metre-high Warsaw skyscraper by Foster + Partners, expected to become the tallest building in Poland. The Varso Tower, or Warsaw Tower, is now under construction on a brownfield site next to the Warszawa Centralna railway station, with completion slated for 2020.
The 1,451-foot Sears Tower was the world's tallest when it was completed. Even after losing its title to Malaysia's Petronas Towers in 1996 and its distinction as the hemisphere's tallest to New York's One World Trade Center in 2013, it remains one of the world's most recognizable skyscrapers.