Contemporary lithograph mocking the new restrictions on the press and free expression. The sign on the wall behind the table reads: "Important question to be considered in today's meeting: 'How long will we be allowed to think?'" The sign in the upper-right corner lists the rules of the Thinkers' Club: "I. The president opens the meeting at precisely 8 a.m./ II. The first rule of a learned society is silence./ III. So that no member, having made full use of his tongue, will end up in prison, muzzles will be distributed upon entry./ IV. The object of discussion, which through mature reflection should be thoroughly discussed at each meeting, will be clearly written in capital letters on a board. [ . . . ] "
The caricature refers to the Carlsbad Decrees, which were implemented at the behest of Clemens Prince von Metternich. The decrees suppressed (national/liberal) student fraternities and imposed tight restrictions on freedom of expression.