The Connected Coasters will light up independent of which friend is using their coaster, simultaneously notifying the users that a) the coaster is working for the user with a drink and b) that the user without a drink can join in the drinking anytime.
Scenario: Ted and Mike are friends who met in college. Ted lives in Austin while Mike lives in Boston. Ted likes to have a drink around 7pm usually, one night he sets his drink down on his Connected Coaster, within minutes his coaster is lighting up with different colors - he knows Mike is there having a drink with him.
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