ATtiny13 + 8* 74hc595 Shift Registers.
It have two modes: random matrix and binary counter clock.
Code: https://github.com/taunoe/attiny13-shift-matrix
Matrix – freeform circuit
ATtiny13 + 8* 74hc595 Shift Registers.
It have two modes: random matrix and binary counter clock.
Code: https://github.com/taunoe/attiny13-shift-matrix
Tauno Erik 
That’s awesome.