Optical illusion processed in HueForge.  My first HueForge attempt.

200 x 200

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
PLA PolyTerra Charcoal Black Transmission Distance: 0.3
PLA PolyLite Natural Transmission Distance: 21
PLA PolyLite Grey Transmission Distance: 1
PLA PolyLite White Transmission Distance: 5

Swap Instructions:
Start with Charcoal Black
At layer #7 (0.64mm) swap to Natural
At layer #12 (1.04mm) swap to Grey
At layer #18 (1.52mm) swap to White for the rest.