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

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