There are 6 shapes on a 7x7 grid. Which shape is closest to the purple 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: purple rectangle at (2, 3)
Distance from target shape to brown right_triangle at (3, 2): 2
Distance from target shape to cyan right_triangle at (6, 2): 5
Distance from target shape to blue right_triangle at (1, 4): 2
Distance from target shape to orange right_triangle at (3, 4): 2
Distance from target shape to yellow right_triangle at (6, 3): 4
Closest shape is the brown right_triangle at (3, 2) with distance 2</think>

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