Techniques and architectures for establishing and/or evaluating a communication session that enables users from the same physical environment, different physical environments, or a combination to interact in a virtual coordinate system and perceive each other as being present are described herein. In some examples, representations of users may be aligned within a coordinate system while maintaining spatial alignment of the user in a physical environment and/or spatial alignment of the representations in another coordinate system. In some examples, a representation of a user may be output to another user in a manner that is aligned to input for the user. In some examples, a human model may be created for a user and used to provide representations of users that map to a human. In some examples, a representation of a user may be evaluated to determine if the representation is properly aligned to the user and/or a coordinate system.