Trzonolinowiec (also known as "Wisielec") is a 41-meter-high, modernist building located in Wrocław, Poland, originally designed by Andrzej Skorupa and Jacek Burzyński. The construction began in 1961 and took 6 years.
The main part of the building is a concrete stem. The floors are attached to the stem and held in place by twelve steel ropes that are attached to the top and to the bottom of the building.
Far from being comfortable and full of faults, the building was nevertheless awarded the title of the Polish house of the year 1967.
The building was stiffened in 1974, the ropes were encased with concrete and reinforced with steel poles on the ground floor. The external and internal walls were also replaced. Currently, it is no longer a hanging building, but in fact a frame building.