There are 4 shapes on a 5x5 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 (3, 4)
Distance from target shape to yellow right_triangle at (1, 2): 4
Distance from target shape to gray right_triangle at (3, 0): 4
Distance from target shape to purple right_triangle at (1, 4): 2
Closest shape is the purple right_triangle at (1, 4) with distance 2</think>

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