Hello @vrtx
I changed colorMode to HSB.
And then changed:
int m1 = millis();
int p = m1 % 200; // I tried many other int amounts starting at 0 up thru 360 to try to get a purple flash,
fill (p, 200, 200); // flashing green
circle(300, 100, 100);
I don’t know how to target for purple using this particular modulo construct. But this might spark some ideas?