Not the same, although the resulting shspes might look similar, a Lissajous pattern displays both channels of a stereo signal as X/Y. That means independent of

Not the same, although the resulting shspes might look similar, a Lissajous pattern displays both channels of a stereo signal as X/Y. That means independent of what is going on if you send it a mono signal, you will just see a 45 degree line — totally independent of the frequencies contained in the audio. This uses FFT to draw circles and makes the harmonics/frequencies visible.