What would the bogart look like if....

it would make the other people 'disappear'.
like the person could only see themself

Well idk, mabey they wouldent be able to see eachother. または mabey the bogart could just give off this feeling of being alone

Well, あなた can be in a room FILLED with people and still feel completely alone. So it probably wouldn't look like anything, it would probably make あなた feel alone like on the inside.