There are 3 shapes on a 3x3 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 (2, 1)
Distance from target shape to gray rectangle at (1, 2): 2
Distance from target shape to purple trapezoid at (2, 2): 1
Closest shape is the purple trapezoid at (2, 2) with distance 1</think>

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