  We model the cytoskeleton as a fractal network by identifying each segment
with a simple Kelvin-Voigt element, with a well defined equilibrium length. The
final structure retains the elastic characteristics of a solid or a gel, which
may support stress, without relaxing. By considering a very simple regular
self-similar structure of segments in series and in parallel, in 1, 2 or 3
dimensions, we are able to express the viscoelasticity of the network as an
effective generalised Kelvin-Voigt model with a power law spectrum of
retardation times, $\cal L\sim\tau^{\alpha}$. We relate the parameter $\alpha$
with the fractal dimension of the gel. In some regimes ($0<\alpha<1$), we
recover the weak power law behaviours of the elastic and viscous moduli with
the angular frequencies, $G'\sim G''\sim w^\alpha$, that occur in a variety of
soft materials, including living cells. In other regimes, we find different
power laws for $G'$ and $G''$.
