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let fillColor = false; //toggle white or redlet mouseposition = true; //if mouse has left the blockfunction setup() { createCanvas(400, 400);}function draw() { background(255); // Draw middle block fill(255); rect(width / 3, 0, width / 3, height); // Draw right block rect((width / 3) * 2, 0, width / 3, height); // Interaction with left block if (mouseX < width / 3 && mouseX > 0) { //if mouse enters the left block if (mouseposition) { fillColor = !fillColor; mouseposition = false; } } else { //if it leaves the block mouseposition = true; } // Draw left block if (fillColor) { fill(255, 0, 0); // Red when toggled on } else { fill(255); // white when toggled off } rect(0, 0, width / 3, height);}