It is a common word heard in most of the offices where some documents go missing and later found after a strenuous search. The reason for the same is quite simple as lack of proper organization of the documents. Indexing, filing and categorization of documents and files will avoid searching time for the missing documents.
The same fact is true in the life of a human being. He is born and brought up in a family with lot of relations. Studied and spent his career among a lot of colleagues and friends. Without proper maintenance of cordial relations and contacts, he will be missing many of them and very few are left by the time he reaches the end of his life.
Missing of any thing will be an incomplete state. A small line or even a faint color will become a prominent drawback for a good painting. Perfection is incomplete when anything is missing in it.