  We consider the "occult" period maps into ball quotients which exist for the
moduli spaces of cubic surfaces, cubic threefolds, non-hyperelliptic curves of
genus three and four. These were constructed in the work of
Allcock/Carlson/Toledo, Looijenga/Swierstra, and Kondo. We interpret these maps
as morphisms into moduli spaces of polarized abelian varieties of Picard type,
and show that these morphisms, whose initial construction is transcendental,
are defined over the natural field of definition of the spaces involved. This
paper is extracted from section 15 of our paper arXiv:0912.3758, and differs
from it only in some points of exposition.
