A door that looks invisible when you first see it, but as you approach or stand in front of it, a shadowing form appears, moves.

The reality is, that form is created by another user in another part of the building. When you reach this part of the building, you see a camera that allows you to move and record your movement [it’s only a shadow of you] and you can see the reaction of the viewer/user who sees your shadowing movement.

Do the users fear, laugh, or dance with the forms and do the form-creators mirror or stand still or jump about?

How do the form-creators feel after realizing the shadowing specter they saw was a person like themselves and one who saw them react?