There are 5 shapes on a 6x6 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 (0, 1)
Distance from target shape to brown rectangle at (2, 1): 2
Distance from target shape to cyan rectangle at (5, 5): 9
Distance from target shape to pink rectangle at (0, 5): 4
Distance from target shape to blue right_triangle at (5, 0): 6
Closest shape is the brown rectangle at (2, 1) with distance 2</think>

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