There are 5 shapes on a 4x4 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, 0)
Distance from target shape to orange trapezoid at (0, 1): 4
Distance from target shape to yellow rectangle at (1, 2): 4
Distance from target shape to green rectangle at (2, 1): 2
Distance from target shape to pink right_triangle at (3, 2): 2
Closest shape is the green rectangle at (2, 1) with distance 2</think>

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