In the same way that people communicate with spoken language, they also express their feelings using unspoken "language" through keeping physical distance, actions or posture.

在使用口头语言交流的同时，人们还使用非口头语言，如保持身体间的距离、用动作或姿势来进行交流。

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"Video conferencing does not give participants the physical sensation of being in the same shared space, and certainly not the physical capability to actually carry out actions in that space, " said Prof Mandayam Srinivasan from UCL who was part of the research team behind the experiment.

BBC: Rats and humans meet via virtual reality and robotics

The thing about physical abstractions (like gestures) versus visual abstractions (like buttons) is that physical actions can be absorbed into muscle memory.

FORBES: Thanks Buttons. Touch, Speech and Gesture Can Take it From Here