Answer: The irony lays in the fact that West Berlin, though walled-in, was a place of freedom.
Step-by-step explanation:
Since many East Germans were flying to West Germany by first getting to West Berlin, a 13 feet high and 100 miles long wall was built around that side of the city. György Ligeti, a Hungarian composer, described the walled-in West Berlin as “a surrealist cage in which those inside are free.”