timestamp/now in views

Sorry for being an idiot but I saw something similar to this in the docs but
haven't been able to find it since.
I tried creating a view using the following syntax
CREATE VIEW prev_day AS SELECT * FROM audit WHERE audit_datetime >
(current_timestamp - interval'24 hours');

Now as some of you will pick up, this creates a view with the current
timestamp set to the creation time of the view, not the actual time the view
was executed.
I hacked around with various combos of quote marks and tried now() and so
on, but to no avail.

Can someone enlighten me?

Cheers,Graeme