There are 6 shapes on a 6x6 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 (0, 4)
Distance from target shape to red right_triangle at (5, 2): 7
Distance from target shape to cyan square at (1, 3): 2
Distance from target shape to orange square at (0, 3): 1
Distance from target shape to blue trapezoid at (1, 0): 5
Distance from target shape to pink square at (2, 5): 3
Closest shape is the orange square at (0, 3) with distance 1</think>

<answer>(0, 3)</answer>