There are 6 shapes on a 4x4 grid. Which shape is closest to the green square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green square at (2, 2)
Distance from target shape to brown rectangle at (0, 3): 3
Distance from target shape to pink trapezoid at (2, 1): 1
Distance from target shape to orange rectangle at (0, 1): 3
Distance from target shape to yellow square at (3, 2): 1
Distance from target shape to gray square at (0, 0): 4
Closest shape is the pink trapezoid at (2, 1) with distance 1</think>

<answer>(2, 1)</answer>