There are 5 shapes on a 4x4 grid. Which shape is closest to the brown right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: brown right_triangle at (2, 1)
Distance from target shape to pink right_triangle at (3, 0): 2
Distance from target shape to red trapezoid at (1, 0): 2
Distance from target shape to green rectangle at (3, 2): 2
Distance from target shape to yellow right_triangle at (1, 2): 2
Closest shape is the pink right_triangle at (3, 0) with distance 2</think>

<answer>(3, 0)</answer>