In order to reorientate stems and branches of (most) trees, reaction wood is produced which provides a force in order to reorientate the tissue \citep{gardiner2014biology}. Reorientation occurs for a number of reasons, it may be upwards as is defined by the negative gravitropism hypothesises or for other reasons such as reorientation toward light or reducing wind drag \citep{niklas2012plant, coutts1995wind}. In softwoods this reorientation is caused by the production of compression wood. Compression wood forms on the lower side or bottom of the branch and expands longitudinally \citep{timell1986compression}. Hardwoods on the other hand produce tension wood on the upper side which contracts longitudinally \citep{gardiner2014biology}. Traditionally the gelatinous layer (G-layer), a layer primarily consisting of low MFA cellulose fibrils on the inside of the fibres, is credited with forming growth stresses within tension wood. However some hardwoods produce tension wood without producing a G-layer such as Eucalyptus nitens \citep{Qiu_2008} and a number of other species \citep{Ruelle_2006}. An intuitive way of envisioning both compression and tension wood is presented in Figure \ref{281884}.