Two image strips projected side by side confront two types of passages: on the one hand the standard frame can be doubled or reduced and multiplied up to four; On the other hand, the image of the sugar that melts implies another type of fragmentation: the crystalline substance disintegrates into its hundreds of constituents before completely dissolving and then reassembling. The ambiguity of the "double screen" lies in the fact that it does not systematically involve twice as many images, but diversified spatial and temporal interactions.