  Invisibility cloaks for flexural waves have been mostly examined in the
continuous-wave regime, while invisibility is likely to deteriorate for short
pulses. Here, we propose the practical realization of a unidirectional
invisibility cloak for flexural waves based on an area-preserving coordinate
transformation. Time-resolved experiments reveal how the invisibility cloak
deviates a pulsed plane-wave from its initial trajectory, and how the initial
wavefront perfectly recombines behind the cloak, leaving the diamond-shaped
hole invisible, notwithstanding the appearance of a forerunner.
Three-dimensional full-elasticity simulations support our experimental
observations.
