Projekt Spiecie is limited to intellectual, relatively courteous magazines based in Poland’s major cities, Warsaw and Krakow. It has not changed the broader political discourse in Poland and, given its short reach, it’s unlikely to. But it is proof that there are ways to breach the walls of the filter bubble. It demonstrates that peaceful disagreement is still possible, and it has shown that this is something many readers on all sides want.

Mr. Malko, 29, is not an influential journalist — he doesn’t consider himself a journalist at all. He’s an economist, author of the book “Economics and its Discontents,” who teaches in a high school. He used to write a weekly column for Krytyka Polityczna, a small, left-wing online magazine with views similar to The Nation in the United States.

His column recommended articles in the Polish or foreign press. “I looked for interesting articles outside my bubble and comfort zone,” he said. For example, when the government first tried to purge the Supreme Court, he devoted his entire column to right-wing perspectives on the crisis.

Readers liked his column. But Mr. Malko was dissatisfied. “I looked for diverse views, but they were still my choices,” he said. He decided to quit writing his own column and organize something bigger. He called the leaders of Krytyka and five other magazines and asked each for a meeting.

One editor declined to join the project; the magazine was overstretched. Krytyka and four other magazines joined: Mr. Piekutowski’s rightist Nowa Konfederacja; Klub Jagiellonski, a conservative Catholic publication; Kontakt, a magazine of the Catholic liberation theology left; and Kultura Liberalna, which espouses free-market views (“liberal” means something different in Europe than in America).

Mr. Malko had no money to offer, and he was talking to magazines that were largely broke. Kontakt, for example, has only one paid employee.

Even without money, it didn’t take much convincing. “We were waiting for something like this,” said Mr. Piekutowski, whose magazine runs not only conservative content, but also occasional interviews with, or articles by, left-wing activists and opinion leaders. “We were fed up with the language of Polish politics: ‘You are a traitor and should go to jail,’” he said.