any is the generic name of various data types. When a terminal of a node is of the any type, the terminal can be connected to any type of terminal without warning (with black line). However, since availability of actual communication depends on implementations in the node, it is recommended to use it as little as possible when attempting to implement nodes yourself. In HARK , its use is limited to the nodes such as MultiFFT , DataLogger , SaveRawPCM and MatrixToMap , which are universally used.