There are 3 shapes on a 6x6 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, 1)
Distance from target shape to green right_triangle at (5, 4): 5
Distance from target shape to yellow square at (2, 0): 2
Closest shape is the yellow square at (2, 0) with distance 2</think>

<answer>(2, 0)</answer>