There are 4 shapes on a 5x5 grid. Which shape is closest to the purple 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: purple right_triangle at (1, 1)
Distance from target shape to green right_triangle at (4, 1): 3
Distance from target shape to blue square at (0, 3): 3
Distance from target shape to red square at (0, 0): 2
Closest shape is the red square at (0, 0) with distance 2</think>

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