The Polarity Switch has an axle. By turning its axle, you rotate the switch among these four states: forward - off - reverse - off. My construction turns the Polarity Switch into a 2-way splitter. When the switch is in its 'forward' state, the input goes into the left output; When the switch is in its 'reverse' state, the input goes into the right output. By connecting the axles of two 2-way splitters together, with 45 degrees of phase difference, you can produce the following combination of states: splitter 1 left off right off splitter 2 off left off right This can be used as a 4-way splitter! (With the sequence left1 - left2 - right1 - right2.) Enclosed is the drawing of this construction in JPEG. The connectors are matched by their colors. The brown connector represents the input, while the black and the red connectors represent the two outputs. If you are familiar with LDraw (See .), here is the .dat file: 1 7 0 -8 0 1 0 0 0 1 0 0 0 1 6551.DAT 1 1 40 16 -20 0 0 1 0 1 0 -1 0 0 5306.DAT 1 1 -40 -16 20 0 0 -1 0 1 0 1 0 0 5306.DAT 1 2 -40 -16 -20 0 0 1 0 1 0 -1 0 0 5306.DAT 1 2 40 0 -40 -1 0 0 0 1 0 0 0 -1 5306.DAT 1 6 40 -16 -20 0 0 1 0 1 0 -1 0 0 5306.DAT 1 6 40 -16 -160 0 0 -1 0 1 0 1 0 0 5306.DAT 1 4 -40 -32 20 -1 0 0 0 1 0 0 0 -1 5306.DAT 1 4 -180 -32 40 1 0 0 0 1 0 0 0 1 5306.DAT 1 0 -40 -32 -20 -1 0 0 0 1 0 0 0 -1 5306.DAT 1 0 -180 -32 -40 1 0 0 0 1 0 0 0 1 5306.DAT Cheers, Hao-yang Wang hywang@pobox.com