Topologically non trivial bulk is mostly hidden in the sense that topological invariants of the bulk are hardly observed directly by experiments. Here we have demonstrated quantum dynamics of a localized manybody wave packet reflects non-tirivial topology without any boundaries. See our recent paper accepted publication in Physical Review Letters, “Detecting bulk topology of quadrupolar phase from quench dynamics” by Tomonari Mizoguchi, Yoshihito Kuno and Yasuhiro Hatsugai. Finite shape of the initial wave packet induces “effective boundaries” for the translationally invariant bulk. See also arXiv:2008.01924.