here is the code and you can run it using https://processing.org/

change the string input with your npub or make better art by changing the stuff after void draw

String input = "npub1tltf8es60957eawprkl4ecs2akkpe6n3wgt4tvphj4vef0mqvxasv6ve7g";

int[] values = new int[input.length()];

void setup() {

size(640, 360);

for (int i = 0; i < input.length(); i++) {

values[i] = (int) input.charAt(i);

}

noLoop();

}

void draw() {

background(255);

int rectWidth = width / values.length;

int rectHeight = height / 2;

for (int i = 0; i < values.length; i++) {

float grayValue = map(values[i], 0, 255, 0, 255);

fill(grayValue);

rect(i * rectWidth, height / 2 - rectHeight / 2, rectWidth, rectHeight);

}

}