  Fracton topological order hosts fractionalized point-like excitations (e.g.,
fractons) that have restricted mobility. In this article, we explore even more
bizarre realization of fracton phases that admit spatially extended excitations
with restriction on both mobility and deformability. First, we present exactly
solvable lattice quantum frustrated spin models and study their ground states
and excited states analytically. We construct a family tree in which parent
models and descendent models share excitation DNA. Second, with the help of
solvability and novel excitation spectrum of these models, we initiate the
first-step of general discussions on quantitative and qualitative properties of
spatially extended excitations whose mobility and deformability are restricted
to some extent. Especially, as a useful viewpoint for understanding such
fracton-physics, all excitations are divided into four mutually distinct
sectors, namely, simple excitations, complex excitations, intrinsically
disconnected excitations, and trivial excitations. Several implications in,
e.g., condensed matter physics and gravity are briefly discussed.
