Clusterings represent a harvest of memories, gathering together to reflect one's situation in the present. Memories are fragments of a time and place we may (or may not) want to recall. They go some way to shape our being and mould the future because memories of past experiences always help to guide us in the direction we want to go and decisions we need to make. Our memories are proof we were there at some point, even if we can't recall each and every exact detail.
These bubbles don't burst like normal bubbles, instead they gradually deflate until there is no more air to sustain them. The only proof of their existence are the remaining feint, membrane skeletons. Science has enabled me to create these special bubbles to ensure their longevity, albeit in a different form of the original. I don't know how long they will remain in this state for only time will tell. The Grace Series evolved from Clusterings.