A little square between the old and new buildings of the National Theatre in Prague was built after the design of Czech architect Karel Prager. Since 4th October 2016 it bears the name of the first Czech president, Václav Havel. At the square, a big granite heart by sculptor Kurt Gebauer is installed for people to write messages inside this sculpture. The space is used for cultural and social events.
Source: https://www.prague.eu/en/object/places/1631/vaclav-havel-square-national-theatre-piazzetta