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

<answer>(1, 0)</answer>