There are 4 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 (1, 2)
Distance from target shape to brown rectangle at (4, 3): 4
Distance from target shape to purple rectangle at (0, 4): 3
Distance from target shape to blue rectangle at (2, 1): 2
Closest shape is the blue rectangle at (2, 1) with distance 2</think>

<answer>(2, 1)</answer>