  In this paper we present the first-ever $L$- and $M$-band interferometric
observations of Circinus, building upon a recent $N$-band analysis. We used
these observations to reconstruct images and fit Gaussian models to the $L$ and
$M$ bands. Our findings reveal a thin edge-on disk whose width is marginally
resolved and is the spectral continuation of the disk imaged in the $N$ band to
shorter wavelengths. Additionally, we find a point-like source in the $L$ and
$M$ bands that, based on the $LMN$-band spectral energy distribution fit,
corresponds to the $N$-band point source. We also demonstrate that there is no
trace of direct sightlines to hot dust surfaces in the circumnuclear dust
structure of Circinus. By assuming the dust is present, we find that
obscuration of A$_{\rm V} \gtrsim 250$ mag is necessary to reproduce the
measured fluxes. Hence, the imaged disk could play the role of the obscuring
"torus" in the unified scheme of active galactic nuclei. Furthermore, we
explored the parameter space of the disk + hyperbolic cone radiative transfer
models and identify a simple modification at the base of the cone. Adding a
cluster of clumps just above the disk and inside the base of the hyperbolic
cone provides a much better match to the observed temperature distribution in
the central aperture. This aligns well with the radiation-driven fountain
models that have recently emerged. Only the unique combination of sensitivity
and spatial resolution of the VLTI allows such models to be scrutinized and
constrained in detail. We plan to test the applicability of this detailed dust
structure to other MATISSE-observed active galactic nuclei in the future.
