There are 5 shapes on a 7x7 grid. Which shape is closest to the blue right_triangle 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 right_triangle at (1, 6)
Distance from target shape to brown right_triangle at (4, 2): 7
Distance from target shape to cyan square at (1, 3): 3
Distance from target shape to green square at (0, 5): 2
Distance from target shape to purple square at (5, 2): 8
Closest shape is the green square at (0, 5) with distance 2</think>

<answer>(0, 5)</answer>