In Calvin and Hobbes, Sunday comics often feature "different" scenarios than the weekday strips, such as strips that feature poems or ones that don't have any dialogue at all. Sunday strips are much less reliant on punchlines and gags than the expression of artistic license. This is consistent with Bill Watterson's insistence that syndicated comics should be treated as a serious art form as opposed to vapid, pandering commercial hackwork.
In the strip's later years, particularly starting with the first sabbatical and subsequent change in format, Sunday comics upstaged story arcs somewhat. As the latter dwindled in frequency, the focus on Sunday strips became narrow: for instance, Spaceman Spiff's appearances were relegated almost exclusively to the larger Sunday format from 1991 onward. Moreover, the comparatively stiff, restrictive structure of the earlier Sunday strips was dropped in order to make way for more unorthodox layouts.