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This paper presents a very simple implementation of a fluid solver. The implementation is consistent with the equations of fluid flow and produces velocity fields that contain incompressible rotational structures and dynamically react to user-supplied forces. Specialized for a fluid which wraps around in space, it allows us to take advantage of the Fourier transform, which greatly simplifies many aspects of the solver. Indeed, given a Fast Fourier Transform, our solver can be implemented in roughly one page of readable C code. The solver is a good starting point for anyone interested in coding a basic fluid solver. The fluid solver presented is useful also as a basic motion primitive that can be used for many different applications in computer graphics.