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$ mkdir foo foo/bar foo/baz foo/bat
$ cd foo
...
d--------- 2 marco marco  4096 2012-08-18 22:07 bar
drwxr-xr-x 2 marco marco  4096 2012-08-18 22:07 bat
drwxr-xr-x 2 marco marco  4096 2012-08-18 22:07 baz

$ cd baz
$ ln -s ../bar bar
...
drwxr-xr-x 5 marco marco 4096 2012-08-18 22:07 ..
lrwxrwxrwx 1 marco marco    6 2012-08-18 22:08 bar -> ../bar
lrwxrwxrwx 1 marco marco    6 2012-08-18 22:08 bat -> ../bat

$ touch t
$ cp t bat
...
t
$ ls bar
ls: cannot open directory bar: Permission denied