There are 5 shapes on a 9x9 grid. Which shape is closest to the blue rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: blue rectangle at (4, 3)
Distance from target shape to cyan square at (0, 2): 5
Distance from target shape to purple trapezoid at (4, 1): 2
Distance from target shape to orange trapezoid at (2, 7): 6
Distance from target shape to gray square at (3, 4): 2
Closest shape is the purple trapezoid at (4, 1) with distance 2</think>

<answer>(4, 1)</answer>