Jet redirection scenario. Top row: Jet precession alone determines the observed morphology, with transverse (a), expansion (b), or contraction (c) motions on the plane of the sky resulting from geometric and projection effects. Bottom row: Panel (d) represents the case of a precessing jet with a period shorter than (or comparable to) the travel time of the jet from the core to the hot spot. In panel (e) the orbital motion of the radio-loud AGN alone determines the observed morphology (see Sect. 5.2 for details). The image is not to scale and is for illustrative purposes only [Illustration by Luca Jerrert Rossi].