1. A system comprising: a processor; a collection engine configured to collect one or more inputs; at least one rule set defined by a user regarding characteristics of the user in a virtual universe; an emotion engine configured to accept the one or more inputs and operate on the at least one rule set by comparing the one or more inputs to the at least one rule set, the emotion engine configured to modify at least one characteristic of a user's mood when the comparing produces a match; and a feedback engine configured to provide feedback to the user based on the comparing, wherein the feedback is separate from the modified at least one characteristic, wherein the feedback includes a prompt for a subsequent action to occur based on a user's determined mood as determined by the emotion engine, the subsequent action being configured to alter the user's determined mood to be different than that modified by the emotion engine, wherein the collection engine, the emotion engine, and the feedback engine operate using the processor, wherein the prompt is provided from a policy table which determines an amount and type of the feedback, wherein the one or more inputs are aggregated from a plurality of users to determine an aggregate mood for the plurality of users, and wherein the determined aggregate mood of the plurality of users is reflected in characteristics of a building associated with the plurality of users.