Yrjö A. Jäntti, the CEO of Werner Söderström Corporation - WSOY in 1952-68, donated his art collection of over thousand works of art to the City of Porvoo in 1984. Besides the collection exhibition at the Art Hall, the works of art can be seen in the City's public locations.

The collection exhibition exhibits the newest part of the collection from 1950s to 1980s. The exhibition consists of paintings, graphics and sculptures. It is working as a gate to modern art as there are many works of art of artists who still works this day.