  Multi-wavelength photometry of brown dwarfs and planetary-mass objects
provides insight into their atmospheres and cloud layers. We present
near-simultaneous $J-$ and $K_s-$band multi-wavelength observations of the
highly variable T2.5 planetary-mass object, SIMP J013656.5+093347. We reanalyze
observations acquired over a single night in 2015 using a recently developed
data reduction pipeline. For the first time, we detect a phase shift between
$J-$ and $K_s-$band light curves, which we measure to be $39.9^{\circ +3.6}_{
-1.1}$. Previously, phase shifts between near-infrared and mid-infrared
observations of this object were detected and attributed to probing different
depths of the atmosphere, and thus different cloud layers. Using the Sonora
Bobcat models, we expand on this idea to show that at least two different
patchy cloud layers must be present to explain the measured phase shift. Our
results are generally consistent with recent atmospheric retrievals of this
object and other similar L/T transition objects.
