The man in the Kilner jar

In his shell no one hears him cry. His pain contained. No one sees his tears. He feels safe yet at the same time lonely and vulnerable. In his own little world he doesn’t need to hide his emotions. In his void he avoids conversation. He is protected from confrontation. Preserved he hides from the outside world in his sterile, safe, secluded environment. Hermetically sealed this hermit cringes. He loves not and is unloved. Cowering cocoon-like he watches passersby. But do they notice him? He hopes not. After all who would spot a man in a jar? Who is he? Who is the man in the Kilner jar?