  M\"uhlig et. al. propose and fabricate a "cloak" comprised of nano-particles
on the surface of a sub-wavelength silica sphere. However, the coating only
reduces the scattered fields. This is achieved by increased absorption, such
that total extinction increases at all wavelengths. An object creating a large
shadow is generally not considered to be cloaked; functionally, in contrast to
the relatively few structures that can reduce total extinction, there are many
that can reduce scattering alone.
