Abstract: A fluid level sensor for sensing a level of a fluid within a toroid-shaped tank includes a float ring, a float structure, a gauge shaft, and a tiller arm. The float ring rotate s within the toroid-shaped tank about a first rotational axis. The float structure exhibits buoyancy in the fluid disposed within the toroid-shaped tank and supplies a force to the float ring based on the level of the fluid within the toroid-shaped tank. The gauge shaft is mounted for rotation about a second rotational axis and rotates about the second rotational axis to a position representative of the level of the fluid within the toroid-shaped tank. The tiller arm supplies the rotational drive force to the gauge shaft when the float ring rotates.

Abstract: Systems and methods for associating mnemonic devices with media content are disclosed. An embodiment can include providing, with a processor, a primary content media source, and connecting a secondary image to the primary content media source by generating an association between the secondary image and the primary content media source, the secondary image adapted to visually depict a mnemonic representation of content of the primary media source. The method can also include storing the association between the secondary image and the primary media source in a third media item (e.g., a Memory Palace), and causing the secondary image to be displayed as a virtual layer of the primary media source in response to a request.