Undefined variable in view

Hello all,

somehow I can't get the pagescontroller to pass a variable to the
view.

I have in my pages_controller.php:

class PagesController extends AppController {
//some code cut out for better reading here

var $uses = array('Category');

function display() {

//some code cut out for better reading here

$this->set('categories', $this->Category-
>find('list'));
}

And in my home.ctp I use just this:
<?php echo $categories; ?>

This returns:
Undefined variable: categories
(from the debug info I can see that PagesController->display() is
used)

When using debug($this->viewVars); I get this:

Array
(
[page] => home
[subpage] =>
[title_for_layout] => Home
)

Can somebody give me advise on what to do?

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