Code Sketch

size(600, 600)
originBottomLeft
cleari()
val tilecount= 100
val tileheight = cheight/tilecount
val tilewidth = cwidth/tilecount
def Shape = Picture.rectangle(tilewidth*2, tileheight*2)
def block(posx:Double, posy:Double){
    val pic =Shape
    pic.setPosition(posx, posy)
    pic.setPenColor(cm.lavenderBlush)
    val d = mathx.distance(posx, posy, mouseX, mouseY)
    val f = mathx.map(d, 0, 500, 0.3, .9)
    pic.scale(f)
    draw(pic)
}
drawLoop {
    erasePictures
    repeatFor(rangeTill(0, cwidth, tilewidth)) { posx =>
        repeatFor(rangeTill(0, cheight, tileheight)) { posy =>
            block(posx, posy)
        }
    }
}