Excerpt:
The woman's shadowed eyes stare out from a black niqab with the poster's tagline urging Swiss voters to reject "uncontrolled naturalisation."
But critics of the campaign image distributed across the country ahead of Sunday's referendum say the poster is really just a brazen appeal to those worried about more Muslims becoming Swiss.
"That is exactly what they are trying to (do)", said Pius Walker, who heads the Zurich-based advertising agency Walker AG.
"It is a very, very frightening thing that is going on here."