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diff --git a/libdimension/dimension/model/interior.h b/libdimension/dimension/model/interior.h
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+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Object interiors.
+ */
+
+/** An interior. */
+typedef struct dmnsn_interior {
+  double ior; /**< Refractive index. */
+} dmnsn_interior;
+
+/**
+ * Create an interior object.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return The new interior.
+ */
+dmnsn_interior *dmnsn_new_interior(dmnsn_pool *pool);
+
+/**
+ * Fill missing interior properties from a default interior.
+ * @param[in]     default_interior  The default interior.
+ * @param[in,out] interiorp         A pointer to the interior to fill.
+ */
+void dmnsn_interior_cascade(dmnsn_interior *default_interior,
+                            dmnsn_interior **interiorp);