Fig. 1.

Noisy growth leads to tissue deformation. A shaded square of side $L$ in the initial state has grown at time $t$ into a larger region with deformed boundaries (red); dashed grid lines indicate the average, uniform tissue dilation. A material point (green circle) initially at $\mathbf{R}$ is displaced to $\mathbf{R}{e}^{{\gamma }_{0}t}+\mathbf{w}$.