Print it. Wire it.
Bring it to life.

#include <RobotShell.h>

void setup() {
  RobotShell.begin();
  RobotShell.face.set(Expression::Happy);
}

void loop() {
  if (RobotShell.distance() < 150) {   // something within 15 cm
    RobotShell.face.set(Expression::Surprised);
    RobotShell.tone(880, 120);
  }
  RobotShell.update();
}