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diff --git a/libdimension/dimension/model/light.h b/libdimension/dimension/model/light.h
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+/*************************************************************************
+ * Copyright (C) 2009-2014 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
+ * Lights.
+ */
+
+#include <stdbool.h>
+
+/* Forward-declar dmnsn_light */
+typedef struct dmnsn_light dmnsn_light;
+
+/**
+ * Light direction callback.
+ * @param[in] light  The light itself.
+ * @param[in] v      The point to illuminate.
+ * @return The direction of light rays pointing from \p v
+ */
+typedef dmnsn_vector dmnsn_light_direction_fn(const dmnsn_light *light,
+                                              dmnsn_vector v);
+
+/**
+ * Light illumination callback.
+ * @param[in] light  The light itself.
+ * @param[in] v      The point to illuminate.
+ * @return The color of the light at \p v.
+ */
+typedef dmnsn_color dmnsn_light_illumination_fn(const dmnsn_light *light,
+                                                dmnsn_vector v);
+
+/**
+ * Light shadow callback.
+ * @param[in] light  The light itself.
+ * @param[in] t      The line index of the closest shadow ray intersection.
+ * @return Whether the point is in shadow.
+ */
+typedef bool dmnsn_light_shadow_fn(const dmnsn_light *light, double t);
+
+/** A light. */
+struct dmnsn_light {
+  /* Callbacks */
+  dmnsn_light_direction_fn *direction_fn; /**< Direction callback. */
+  dmnsn_light_illumination_fn *illumination_fn; /**< Illumination callback. */
+  dmnsn_light_shadow_fn *shadow_fn; /**< Shadow callback. */
+};
+
+/**
+ * Create a dummy light.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return The allocated light.
+ */
+dmnsn_light *dmnsn_new_light(dmnsn_pool *pool);
+
+/**
+ * Initialize a dmnsn_light field.
+ * @param[out] light  The light to initialize.
+ */
+void dmnsn_init_light(dmnsn_light *light);