Kastalia configures Template::Toolkit with custom delimiters -- <% and %> instead of TT's usual [% and %] -- and with ANYCASE enabled, so template directives are not case-sensitive. Templates live as .tt files under views/, and are free to call back into the shared Perl namespace described in the Backend section to fetch whatever graph data they need (a knot's children, its echoes, its illustrations, and so on) before rendering.

Most pages share common fragments via an INCLUDE directive pointing at "layouts/..." -- the flash-message banner used across the site, for instance, lives in a single shared layout rather than being duplicated into every page template that needs it.