johnny@chthon:~/tmp > mkdir foobar
johnny@chthon:~/tmp > ls -l
total 1
drwxr-xr-x   2 johnny   users        1024 May  4 07:10 foobar
johnny@chthon:~/tmp > perl -e 'umask(0666); chmod(0777,'foobar');'
johnny@chthon:~/tmp > l
total 4
drwxr-xr-x   3 johnny   users        1024 May  4 07:10 ./
drwx------  12 johnny   users        2048 May  3 23:09 ../
drwxrwxrwx   2 johnny   users        1024 May  4 07:10 foobar/
johnny@chthon:~/tmp >
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Other things, such as mkdir, are affected by the umask:

andy@okura:[/tmp/test] mkdir foobar
andy@okura:[/tmp/test] ls -l
total 4
drwxr-xr-x    2 andy     andy         4096 Jun 20 14:55 foobar
andy@okura:[/tmp/test] perl -e 'umask(0666); chmod(0777,'foobar'); \
> mkdir('foobar2',0777);'
andy@okura:[/tmp/test] ls -l
total 8
drwxrwxrwx    2 andy     andy         4096 Jun 20 14:55 foobar
d--x--x--x    2 andy     andy         4096 Jun 20 14:55 foobar2
[download]