  For a semisimple complex Lie algebra $\mathfrak g$, the BGG category
$\mathcal{O}$ is of particular interest in representation theory. It is known
that Irving's shuffling functors $\mathrm{Sh}_{w}$, indexed by elements $w\in
W$ of the Weyl group, induce an action of the braid group $B_W$ associated to
$W$ on the derived categories $D^\mathrm{b}(\mathcal{O}_\lambda)$ of blocks of
$\mathcal{O}$.
  We show that for maximal parabolic subalgebras $\mathfrak{p}$ of
$\mathfrak{sl}_n$ corresponding to the parabolic subgroup
$W_\mathfrak{p}=S_{n-1}\times S_1$ of $S_n$, the derived shuffling functors
$\mathbf{L}\mathrm{Sh}{s_i}$ are instances of Seidel and Thomas' spherical
twist functors. Namely, we show that certain parabolic indecomposable
projectives $P^\mathfrak{p}(w)$ are spherical objects, and the associated twist
functors are naturally isomorphic to $\mathbf{L}\mathrm{Sh}{w}[1]$ as
auto-equivalences of $D^\mathrm{b}(\mathcal{O}^\mathfrak{p})$.
  We give an overview of the main properties of the BGG category $\mathcal{O}$,
the construction of shuffling and spherical twist functors, and give some
examples how to determine images of both. To this end, we employ the
equivalence of blocks of $\mathcal{O}$ and the module categories of certain
path algebras.
