  Capillary origami is the wrapping of an usual fluid drop by a planar elastic
membrane due to the interplay between capillary and elastic forces. Here, we
use a drop of magnetic fluid whose shape is known to strongly depend on an
applied magnetic field. We study the quasi-static and dynamical behaviors of
such a magnetic capillary origami. We report the observation of an overturning
instability that the origami undergoes at a critical magnetic field. This
instability is triggered by an interplay between magnetic and gravitational
energies in agreement with the theory presented here. Additional effects of
elasticity and capillarity on this instability are also discussed.
