Why won't my circle move?

import random
from graphics import *

window = GraphWin("gameWindow", 1000, 1000)
myImage = Image(Point(400,400), "Yun.gif")
myImage.draw(window)

c = Circle(Point(50,50), 10)
c.draw(window)
    
class Piece(object):
    def moveTo(c):
        oldPos=c.getCenter()
        oldX, oldY = oldPos.getX(), oldPos.getY()
        roll = 4
        newX, newY = oldPos.getX()+roll, oldPos.getY()+roll
        moveX = newX - oldX
        moveY = newY - oldY
        c.move(moveX, moveY)
        

def main():
    move = Piece()
    move.moveTo()
    c.moveTo()
    print "yay"