[boomlinde]

`s` is some value that occupies some memory, starting at say address 1000. `ps` contains the address of `s`, 1000. It will do this no matter what you put in memory at address 1000. You can assign new values to `s`, e.g. via append, but ps will still point to its address, 1000.

The confusion stems from the fact that a slice object contains a pointer in itself, pointing to a backing array, thus adding an additional layer of indirection. Append will return a new slice that may point to a different backing array. This doesn't matter, because you put the new slice in the memory location pointed at by ps, 1000.

This is not so different from pointer pointers. If you have `int i = 0; int pi = &i; int *ppi = π` you can change `pi` (analogous to the slice) to your heart's content and `ppi` will reflect the changes.