There are 5 shapes on a 6x6 grid. Which shape is closest to the brown 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: brown rectangle at (3, 5)
Distance from target shape to orange right_triangle at (1, 4): 3
Distance from target shape to red square at (5, 5): 2
Distance from target shape to yellow rectangle at (0, 4): 4
Distance from target shape to blue square at (2, 0): 6
Closest shape is the red square at (5, 5) with distance 2</think>

<answer>(5, 5)</answer>