Mechanists have also recently borrowed from Alon’s (2006; Milo et al. 2002) work on network motifs, repeated patterns in causal networks, to expand the vocabulary for thinking about abstract patterns of organization (Levy 2014; Levy and Bechtel 2012). Understanding how parts compose wholes is likely to be a growth area in the future of the mechanistic framework. (For some other recent additions, see Kuorikoski and Ylikoski 2013; Kuhlmann 2011; Glennan forthcoming.)