Geometric universality and anomalous diffusion in frictional fingers
Kristian Stølevik Olsen , Eirik Grude Flekkøy, Luiza Angheluta, James Matthew Campbell, Knut Jørgen Måløy and Bjørnar Sandnes
New J. Phys. 21 (2019) 063020
Surely the biggest labyrinths the world has ever seen.