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Getting the Ace of Cups upright shows that it's time to let loose of whatever emotional baggage you have and start living your life to the fullest. Like with all the other aces, there is a new beginning that is indicated here - a chance to start fresh. It might come in the form of opening yourself up to the possibilities of new relationships, romantic or otherwise, that have the ability to make you emotionally fulfilled. The release indicated by this card may either be spiritual or emotional, depending on what you are going through. The Ace of Cups may come to a reading after a long period of being lonely or enduring something that deeply hurt you emotionally, and it's appearance may be there to herald the turning over a new leaf.
When the Ace of Cups is overturned, the image here is clearest - the waters pour out of the cup, it becomes empty, the gift of its waters are being wasted. Seeing the Ace of Cups upside down during your reading means you have been enduring emotional instability or pain for some time. There is a loss that is indicated here, and perhaps something that has meant much to you is no longer giving you the joy that it once had.
Since the cups also govern creativity, you may also be experiencing a creative block of sorts, and where the waters of inspiration once flowed, they have now dried up.
Watching your style develop over the course of this thread is wonderfully inspiring.