the invention relates to a folding card 1 with a cover 2 that is connected to a back 3 by at least one fold line f 1 and with an internal folding system 4 , that is connected at least to the inside surface 3a of the back 3 and can assume a three - dimensional form when the card is unfolded . in order to achieve a particularly effective and optimal effect , the internal folding system 4 consists of at least two superimposed frame elements that change their relative positions when the card is unfolded and whose windows are of differing sizes , whereby the size of the windows increases in the order of the successively overlapping frame elements . the largest window is the one located furthest from the back .