The specification describes a selectively reversible, portable enclosure comprising a collapsible framework having a flexible covering associated therewith, the flexible covering having opposite first and second surfaces each bearing a distinct color, pattern, or other indicia. In embodiments, requests for a missing data segment of television media content are received from client devices that determine the missing data segment has not been received. When the output from the tanning lamp has sufficiently decreased over time due to use, the first input voltage is increased to increase the output to an effective level. Wearable devices are also able to exchange information with a portal server. The ARS returns the vendor server address to the user PC whereby the vendor advertiser server is automatically accessed by the user PC. 33 inclusive, and an average primary particle diameter of the compound is in a range from 0.