The present invention provides a method and apparatus for simulating an aerial image projected from an optical system, wherein the optical system includes a pupil and a mask. A location updating request is received from the terminal over the wireless access network. The assembly further includes a processed adhesive layer between top and bottom surfaces of respective pre-processed substrates. The multiple strands of the elastic string in conjunction with the elasticity of the string generate a random motion of the sack when the sack moves relative to the string. When a disturbance occurs in the dental composite, the capsule ruptures so that the catalyst initiates a condensation reaction between the molecule with one or more silanol groups and the one or more alkoxy groups thereby healing the dental composite. An automobile headrest seat comprising of a headrest retractable hat hook hanger built into the right side and left side of the headrest that retracts inside the headrest for storage and can extend out the double hat hook from the both sides of the headrest to hang hats, caps, and coats.