] Memory mirror reflects a period of time (e.g. 24 hours of
] a day). As we use an item, it is visually posted to the
] mirror as shown in figure 1, and is recorded in a history
] log. If we had already used an item, an episode mirror
] reflects details of the previous number of usages. The
] memory mirror also warns of possibly lost items that have
] yet to be returned.

blogged for future reference. slightly different application than the MIT biometrics mirror.