yellow flowers near body of water during daytime

Finlandia Hall is a congress and event venue in the centre of Helsinki on the Töölönlahti Bay, owned by the City of Helsinki. Finlandia Hall features an optical illusion[citation needed]: the National Museum building on the other side of the street seems to rise from the edge of the Finlandia Hall tower. The effect is created by a black trapezium on the white marble surface of the Finlandia Hall tower. The trapezium has been measured to fit the rising tower of the National Museum when the Finlandia Hall is viewed from the eastern shore of the Töölönlahti Bay.