def glass(extracted_pic, fuzz):
    width = extracted_pic.width()
    height = extracted_pic.height()
    glass_image = Picture(width, height)
    if fuzz > 10.0 or fuzz < -10.0:
        stdio.write('ERROR: too much fuzz')
        quit()
    else:
        for col in range(width):
            for row in range(height):
                col_col = (width + col + random.randint(fuzz, 20)) % width
                row_row = (height + row + random.randint(fuzz, 20)) % height
                asd = extracted_pic.get(col_col, row_row)
                glass_image.set(col, row, asd)
    return glass_image