![Figure 4: The two sequences for the cross correlation of x0[n] and x3[n].](https://www.wavewalkerdsp.com/wp-content/uploads/wordpress-popular-posts/5515-featured-75x75.png)
I came across this GIF of Rodney Dangerfield and saw the unit circle in the bottom right hand corner:
Always nice to see elements of DSP sprinkled into the real world!
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