Abstract: In some embodiments, an electronic device emphasizes and/or deemphasizes user interfaces based on the gaze of a user. In some embodiments, an electronic device defines levels of immersion for different user interfaces independently of one another. In some embodiments, an electronic device resumes display of a user interface at a previously-displayed level of immersion after (e.g., temporarily) reducing the level of immersion associated with the user interface. In some embodiments, an electronic device allows objects, people, and/or portions of an environment to be visible through a user interface displayed by the electronic device. In some embodiments, an electronic device reduces the level of immersion associated with a user interface based on characteristics of the electronic device and/or physical environment of the electronic device.

Abstract: A conventional pumping unit is mounted at ground level, to which is attached a hollow sucker rod that extends through a tubing string to the production level of the well. Integral with the tubing string is provided a pump barrel, with communication between the production formation and the tubing string being effected across a ball and seat check valve.Secured to the lower extremity of the hollow sucker rod is an elongated sleeve-like pump housing having a sealing element at the lower extremity thereof establishing a seal between the pump housing and the pump barrel. Intermediate the extremities of the hollow pump body is formed a plurality of elongated slot-like ports extending parallel with the longitudinal axis of the pump body. An elongated traveling piston is located for reciprocal movement within the pump body and is also provided with a seal at the lower extremity thereof for establishing a sealed relationship with the pump barrel.