There are 3 shapes on a 4x4 grid. Which shape is closest to the cyan 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: cyan right_triangle at (2, 3)
Distance from target shape to brown rectangle at (2, 1): 2
Distance from target shape to pink trapezoid at (2, 0): 3
Closest shape is the brown rectangle at (2, 1) with distance 2</think>

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