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

<answer>(2, 5)</answer>