There is also a reddit post with further discussion.
<a href="https://old.reddit.com/r/math/comments/153gh89/reverse_tomography/" rel="nofollow noreferrer">https://old.reddit.com/r/math/comments/153gh89/reverse_tomog...</a>
This simple program demonstrates that 8 audio speakers can deliver completely different customized signals to 8 specific locations.<p>This has applications for surround sound and directed energy.