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+#ifndef TANGIBLE_H_746DB3EE
+#define TANGIBLE_H_746DB3EE
+
+#include <set>
+#include "component.h"
+#include "entity_manager.h"
+#include "vector.h"
+#include "direction.h"
+
+class PonderableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * List of different types of physical bodies.
+   *
+   * vacuumed     - Default.
+   * freefalling  - The body will be treated as if there were a downward force
+   *                of gravity being exerted onto it. The body will also exhibit
+   *                terminal velocity (that is, its downward velocity will be
+   *                capped at a constant value).
+   */
+  enum class Type {
+    vacuumed,
+    freefalling
+  };
+
+  /**
+   * List of different types of collidable surfaces.
+   */
+  enum class Collision {
+    wall,
+    platform,
+    adjacency,
+    warp,
+    danger,
+    event
+  };
+
+  /**
+   * Constructor for initializing the body type, which is a constant.
+   */
+  PonderableComponent(Type type) : type(type)
+  {
+  }
+
+  /**
+   * The velocity of the body.
+   */
+  vec2d vel = { 0.0, 0.0 };
+
+  /**
+   * The acceleration of the body.
+   */
+  vec2d accel = { 0.0, 0.0 };
+
+  /**
+   * The type of physical body that the entity is meant to assume. The body will
+   * be acted upon differently based on this. See the enumeration above for more
+   * details.
+   *
+   * @managed_by PonderingSystem
+   */
+  const Type type;
+
+  /**
+   * Whether or not a freefalling body is in contact with the ground.
+   *
+   * @managed_by PonderingSystem
+   */
+  bool grounded = false;
+
+  /**
+   * Whether or not a freefalling body is being ferried by another body.
+   *
+   * @managed_by PonderingSystem
+   */
+  bool ferried = false;
+
+  /**
+   * The entity that is ferrying this body, if there is one.
+   *
+   * @managed_by PonderingSystem
+   */
+  id_type ferry;
+
+  /**
+   * The side of the ferry that the body is resting on, if there is one.
+   *
+   * @managed_by PonderingSystem
+   */
+  Direction ferrySide;
+
+  /**
+   * The bodies that are being ferried by this body.
+   *
+   * @managed_by PonderingSystem
+   */
+  std::set<id_type> passengers;
+
+  /**
+   * If enabled, this will prevent the body from moving and accelerating. The
+   * velocity and position of the body can still be affected by sources external
+   * to the PonderingSystem. Enabling this will cause applicable bodies to
+   * become ungrounded and unferried.
+   */
+  bool frozen = false;
+
+  /**
+   * If disabled, collision detection for this body will not be performed and
+   * other bodies will ignore it. Disabling this will cause applicable bodies to
+   * become ungrounded and unferried.
+   */
+  bool collidable = true;
+
+  /**
+   * The effect that colliding with this body has.
+   */
+  Collision colliderType = Collision::wall;
+
+  /**
+   * If this flag is disabled, the entity will be ignored by the pondering
+   * system.
+   *
+   * @managed_by RealizingSystem
+   */
+  bool active = false;
+};
+
+#endif /* end of include guard: TANGIBLE_H_746DB3EE */