There are 4 shapes on a 4x4 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 (0, 1)
Distance from target shape to gray square at (1, 3): 3
Distance from target shape to purple square at (1, 2): 2
Distance from target shape to green trapezoid at (3, 0): 4
Closest shape is the purple square at (1, 2) with distance 2</think>

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