The skeleton is made with 0.9mm and 0.55mm copper wire. The idea started as a very rough sketch in a notebook, and improvised in 3D by eye.
At first I was thinking of embedding a microprocessor in the project, but eventually decided to keep it old school with a classic 555 timer and CD4017 decade counter combo.
The base is made from some copper PCB stock and 3 cork coasters. It includes a CR2032 coin cell holder, switch and some external power connector pins.
The circuit is a very simple variation of the classic CD4017 counter with a 555 astable clock source. A light-dependent resistor provides some frequency variation depending on available light. The LDR ranges from around 1kΩ when in light to 10kΩ when in darkness, corresponding to a clock frequency range of perhaps 6.5Hz to 34Hz. The two CD4017 counters are wired in parallel - mainly for symmetry in the final design.
Up to 5 LEDs are attached to each counter output (not all pins are actually used in my final build). Enamelled 0.2mm magnet/winding wire is used for connecting the the LEDs, which are grounded on the main skeleton. I kept the internal wiring messy to provide some chaotic volume to the "pollen" while still maintaining transparency.
This is a quick capture of the view from the front, where a distinct pattern in the LEDs is apparent:
When viewed from other angles, the LEDs dissemble into a chaotic display:
I'd like to do a better 360 view if I can rig up a turntable photo stage. For now, a very manual tour is in this youtube clip: