There are 5 shapes on a 6x6 grid. Which shape is closest to the blue 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: blue rectangle at (2, 3)
Distance from target shape to red trapezoid at (2, 4): 1
Distance from target shape to brown rectangle at (3, 2): 2
Distance from target shape to pink trapezoid at (3, 5): 3
Distance from target shape to orange right_triangle at (4, 1): 4
Closest shape is the red trapezoid at (2, 4) with distance 1</think>

<answer>(2, 4)</answer>