The Series composite is the most basic structure for connecting MarSystems into dataflow networks through implicit patching. It is similar to Unix pipes or the chuck operator in the Chuck programming language. The output of the first object in the Series connection becomes the input to the second object, the output of the second object becomes the input to the third object etc. A MarSystem can potentially have different size and characteristics for the input and output slices. In Series connections these characteristics are constrained to ensure that the output slice of each MarSystem is the same as the input slice of the MarSystem that is downstream from it. The figure shows how a Series composite can be used to express a complex spectrum computation from a windowed segment of audio. The Hanning MarSystem windows the incoming segment and the FFT MarSystem converts the audio to a complex spectrum. Notice how the dimensions of the slices can change at the different stages of processing.