  We describe an effective active cloaking strategy for the scalar Helmholtz
equation in three dimensions where multipole active sources are located at the
vertices of the Platonic solids. A "silent zone" is created interior to the
imaginary Platonic solid and only the incident field remains in a defined
region exterior to the silent zone and active source configuration. This
distribution of the sources ensures that the implementation of the cloaking
strategy is extremely efficient. In particular, once the multipole source
amplitudes required at a single source location are determined, the other
source amplitudes can be calculated by simple post-processing involving
multiplication of the multipole source vector by a rotation matrix. The general
nature of the problem means that the technique is relevant to any scalar wave
field, including both acoustics and electromagnetism.
