long acronym phrases for things we love in the natural world

BFTL
Bio-Filtered Trans-Luminescence

The phenomenon of light being transmitted through a (usually thin)  
bio-membrane (such as a leaf) so that the membrane appears to glow in
contrast to the ambient reflected light.  BFTL is a subset of the larger
category of Filtered Trans-Luminescence, which has the further qualities:

HCFTL (high contrast) - when the transmitted light is unusally bright or the 
reflected light unusually dim (a paper lantern is an example)

MCFTL (medium contrast)

LCFTL (low contrast) - when the transmitted light barely stand out compared
to the reflected light (often a very eerie effect)

To be most precise, BFTL is a subset of Heterogeneous FTL, where the entire
transmitting membrane is not characterized by smooth (Homogeneous)
color/transmittance/etc properties, but is dominated by internal variation:
veins in a leaf, color irregularities in a natural paper, etc.

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FSC c TDFC i VNS

Full Sensory Clarity consequent to
Thermically Disparate Fluid Cycling induced
Vascular and Neural Stimulation

hot springs / frozen snow