There are 2 shapes on a 4x4 grid. Which shape is closest to the blue trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: blue trapezoid at (2, 1)
Distance from target shape to cyan rectangle at (2, 3): 2
Closest shape is the cyan rectangle at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>