What am I missing?

Something to think about:

function setup() {
	createCanvas(600, 600);
	background(255);
}

function draw() {
	background(255);
	for(i = 0; i <= 100; i = i + 10){
	//fill(3*i, 0, 0);	
	circle(300, 300, 100-i);
	}
}

Try it with and without fill.

It’s all about layers!

:)

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