TMCA curator's advisor Gholam Ali Taheri, German secretary of the exhibit Heike Stockhaus, and German cultural attaché in Tehran Filiz Durak attended a press conference on Sunday.
"Barlach and Kollwitz were selected for the show for their similarities to the Iranian artists that emerged after the (1979 Islamic) Revolution, as well as for their concerns for human agonies," Taheri said according to MNA.
A total of 25 sculptures and 167 drawings are on display at the showcase, which will run until January 24, 2009.
The organizers plan to screen a number of documentary films on Barlach and Kollwitz during the show.
Barlach and Kollwitz began their career during a period when the world was rapidly evolving into the modern era, Stockhaus said.
In 1940s, these artists tried to simplify human characteristics in order to depict them in their works, she added.
Although some of the artwork dates back about 100 years, it still maintains a relationship with modern man today, Stockhaus noted.
The exhibition is also cosponsored by the German Foreign Office and the Goethe-Institut.
Barlach's style has often been called "modern Gothic." He had also tried his hand at graphic art and playwriting. He was most famous for his preoccupation with the suffering of humanity, a theme that predominated in all his artwork.
Kollwitz was characterized as being an eloquent advocate for victims of social injustice, war and inhumanity.