“…The Lissajous singularities can be created by second-hormonic generation with commensurate frequencies or can emerge from the incoherent addition of two incommensurate vector beams [1,4,[10][11][12]. It is well known that there exist Lissajous figures with definite shapes after an enough large number of optical cycles whether the frequencies of polychromatic vector beams are coherent or incoherent [1,4,14,15].…”