Shapes inside shapes

Haven’t touched Processing in a while so need to refresh some things. I have these 2 circles that I’m trying to use as eyes for an animal. Is it possible to put shapes inside shapes? I want to add more circles within these 2 circles for the iris and stuff. I checked the documentation but I’m not seeing anything I could use.

void setup() {
  size(300, 200);
 circle(50, 46, 55);
 circle(130, 46, 55);

There are tutorials, examples and references on the Processing website: