There are 5 shapes on a 4x4 grid. Which shape is closest to the pink 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: pink rectangle at (0, 3)
Distance from target shape to red right_triangle at (2, 0): 5
Distance from target shape to cyan right_triangle at (2, 3): 2
Distance from target shape to blue rectangle at (2, 1): 4
Distance from target shape to orange rectangle at (3, 0): 6
Closest shape is the cyan right_triangle at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>