Studies show that 90% of employees personalize their workspaces even if it is against the rules of their companies. And research also shows that people personalize their workspaces because of two things: Relationship and Self-regulation.
Personalizing workspaces is a way to represent oneself to someone and becomes a medium in starting a conversation with others. This helps in building a good or positive relationship to others that results in effective team work.
Personalizing workspaces also helps a person to manage himself like a reminder of their personal goal or the reason why they are working.