There are 4 shapes on a 5x5 grid. Which shape is closest to the orange 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: orange rectangle at (2, 1)
Distance from target shape to blue trapezoid at (1, 4): 4
Distance from target shape to gray trapezoid at (3, 1): 1
Distance from target shape to cyan square at (3, 3): 3
Closest shape is the gray trapezoid at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>