Toompea Castle houses in its heart the building of the parliament of the Republic of Estonia – the Riigikogu – from 1922. This is an intriguing building that stands on the spot of a former convent and behind the provincial administration building with its look of a residential city palace. This could be taken as a metaphor for the Estonian culture growing out of the combined womb of Baltic German, Russian, and Swedish cultures. The building was completed in 1922 by architects Herbert Johanson (1884–1964) and Eugen Habermann (1884–1944) who were in the prime of their creative powers at the time.
The exhibition "Riigikogu Hoone 100" was designed for the 100th anniversary of the building of the Estonian Parliament. It covers the entire house and does not have one clear center or dominator. The symbolic geometrical forms have different dimensions and are scattered all over the Parliament building, even in surprising places. The modernist geometry contrasts with the aesthetics of the building, signaling a special moment, a festive exhibition situation. It is a programmatic intervention of modernism in the historic space—an allegory for the birth of parliamentary democracy and a metaphor for the emergence of modern social order.