There are 3 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 (1, 5)
Distance from target shape to orange right_triangle at (2, 0): 6
Distance from target shape to yellow rectangle at (2, 5): 1
Closest shape is the yellow rectangle at (2, 5) with distance 1</think>

<answer>(2, 5)</answer>