Looking at the answers collected, I had confirmation that objects are not interpreted only for what they are, but also for what they represent.
The cup remained mostly connected to everyday and personal moments: breakfast, coffee, a small ritual of calm. The keys, instead, led to more symbolic interpretations: not only an object used to open doors, but a symbol of home, independence and responsibility. The chair, perhaps the most open object, collected very different interpretations: comfort, work, waiting, loneliness.
This experiment made me notice once again that an object is never perceived only for what it is. Its shape can suggest something, but meaning takes shape through the person looking at it, through the memories and experiences they bring with them.
I was also surprised by how little is needed to transform an ordinary object into a story.