  A method to calculate matrix representations of the twist element $\ff$ of
Drinfel'd -- chosen to be unitary -- is given and illustrated at some examples.
It is observed that for these F-matrices the crystal limit $q\!\to\! 0$ exists
and that \mbox{F-matrices} twisting from $0$ to $q$ are of a simpler form than
F-matrices twisting from $1$ to $q$. These results lead to a new interpretation
of $q$-deformation in terms of tensor products of finite-dimensional
representations of compact simple Lie groups.
