Source google image: https://4.bp.blogspot.com/-ZdI72rco9eQ/V4FsnWCrb5I/AAAAAAAAAj4/nf0cGxPygAw3a5QiG_BN0v0Uzfe_R8oqQCLcB/s1600/Log%2BIn%2BCircled.jpg
Lego ideas how it works
Source google image: https://4.bp.blogspot.com/-ZdI72rco9eQ/V4FsnWCrb5I/AAAAAAAAAj4/nf0cGxPygAw3a5QiG_BN0v0Uzfe_R8oqQCLcB/s1600/Log%2BIn%2BCircled.jpg