Typical morphology of WR and [WR] nebulosities. The images were constructed from WISE observations. The red, green, and blue channels correspond to W4 (24 μm), W2 (4.6 μm), and W1 (3.4 μm) filters, respectively. Left panel: RaMul2 [WR] PN, whose colors and morphology are typical of a young and compact PN. The field of view is 6′ × 5′. Right panel: WR102 ring nebula, showing a complex morphology made of several bubbles. The field of view is 10′ × 10′.