There are actually uses (well, at least one that I can think of) for our beyond use 'strict' context. I have had occasion to use our at the top of a file that contained multiple packages so that I could have a package global that was accessible without full qualification throughout the file. E.g.:

package X;

our $global = 'Xglobal';

... more stuff here ...

package Y;

print $global;
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When run, this code prints Xglobal even though the reference to $global is in package Y's space and it was defined as being a global in package X. The our makes all unqualified references to the variable be assumed to be in the X package namespace even after you move into a different namespace. The same effect can be obtained with my(), except that then the variables are not accessible to other perl code that uses/requires this code.