“…A long series of later works, culminating in papers by Alamdari, Angelini, Barrera-Cruz, Chan, Da Lozzo, Di Battista, Frati, Haxell, Lubiw, Patrignani, Roselli, Singla, and Wilkinson [1], and Kleist, Klemz, Lubiw, Schlipf, Staals, and Strash [32], describe efficient algorithms to construct planar morphs with explicit piecewise-linear vertex trajectories, all ultimately based on Cairns' inductive edge-collapsing strategy. (Alamdari et al [1] and Roselli [42] provide more detailed history of these results.)…”