There are 4 shapes on a 5x5 grid. Which shape is closest to the blue trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: blue trapezoid at (0, 3)
Distance from target shape to yellow rectangle at (2, 1): 4
Distance from target shape to purple right_triangle at (4, 1): 6
Distance from target shape to cyan square at (3, 2): 4
Closest shape is the yellow rectangle at (2, 1) with distance 4</think>

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