  We provide an overview of experiments exploring resonances in the collision
of ultracold clouds of atoms. Using a laser-based accelerator that capitalizes
on the energy resolution provided by the ultracold atomic setting, we unveil
resonance phenomena such as Feshbach and shape resonances in their
quintessential form by literally photographing the halo of outgoing scattered
atoms. We exploit the tunability of magnetic Feshbach resonances to instigate
an interplay between scattering resonances. By experimentally recording the
scattering in a parameter space spanned by collision energy and magnetic field,
we capture the imprint of the $S$-matrix pole flow in the complex energy plane.
After revisiting experiments that place a Feshbach resonance in the proximity
of a shape resonance and an anti-bound state, respectively, we discuss the
possibility of using $S$-matrix pole interplay between two Feshbach resonances
to create a bound-state-in-the-continuum.
