
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the complex plane, the conjugate of the complex number $z= \frac {2i}{1+i}$ (where $i$ is the imaginary unit) is denoted as $\overline {z}$, and its corresponding point is $A$. The point $A$ is symmetric to point $B$ with respect to the origin $O$. Find:  
(Ⅰ) The quadrant in which point $A$ is located;  
(Ⅱ) The complex number corresponding to the vector $\overrightarrow{OB}$.

Present the answer in LaTex format: \boxed{Your answer}
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