  We describe the constructible derived category of sheaves on the $n$-sphere,
stratified in a point and its complement, as a dg module category of a formal
dg algebra. We prove formality by exploring two different methods: As a
combinatorial approach, we reformulate the problem in terms of representations
of quivers and prove formality for the 2-sphere, for coefficients in a
principal ideal domain. We give a suitable generalization of this formality
result for the 2-sphere stratified in several points and their complement. As a
geometric approach, we give a description of the underlying dg algebra in terms
of differential forms, which allows us to prove formality for $n$-spheres, for
real or complex coefficients.
