Adrian Selby's book Brother Red[1] contains a race of people, the Oskoro and Ososi, who appear to undertake trepanning and then plant things in their heads. At

Adrian Selby's book Brother Red[1] contains a race of people, the Oskoro and Ososi, who appear to undertake trepanning and then plant things in their heads. At least that's how I imagined it! [1] https://www.adrianselby.com/brother-red-2020-orbit/ https://www.adrianselby.com/brother-red-2020-orbit/