For clarity sake a firefly is not a fly but a bug.
Used wood: paduk from Gabon - Africa and beech from Prinsengracht Amsterdam. The bark is from an elm tree along Noordhollands canal. The beech an elm trees fell after a storm.
Metals: zink and copper.

In the dark the glass marbles have a fading glow effect.
€350

Single fly on bark.
€85