A physical mechanics model of wood must at least acknowledge anisotropy: stiffness and creep depend on loading direction. Direction-dependent elastic elements can represent different small-strain moduli, and delayed elastic branches can approximate time-dependent strain. A linear-solid network can therefore be a local fit under specified direction, moisture and temperature, rather than a universal scalar constitutive law.
If experiments show an immediate strain followed by delayed creep, a spring plus a Voigt branch can capture those features. If permanent set remains after unloading, that recoverable model is insufficient and an irreversible deformation branch or damage law is needed. Strength loss, splitting, moisture-dependent response and nonlinear compression cannot be represented by one fixed linear Voigt element.
TODO: Match the network and any irreversible branch to the unavailable practical-class observations. These are conditional materials-mechanics possibilities, not invented laboratory results. No biological structure or organism-specific mechanism is required here.

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