Exploring different types of particle systems inside Touch Designer.
Particles Feedback : 

First introduction to particles system inside Touch Designer, 

I'm using TOP instancing based on noise and feedback.   

Inspired by 

@elekktronaut

Particles GPU :

Based on a tutorial by Crazy Studio, I'm using the particlesGPU component inside Touch Designer to create a particle system that reacts to the collision of animated spheres using Noise CHOP data.