In this short film, British neurologist Raymond Tallis argues that consciousness is not an internal construct, but rather relational. Through the intriguing notion that humans are physically unable to tickle themselves, Tallis explores the philosophical notion that we become ourselves only through dialogue with others. Shouldn’t Descartes’ first tenet “I think, therefore I am” rather be: we dialogue, therefore we are? A view underscored by the observation that many sensations can only be triggered by others. Images of a heated television-debate on the war in Syria, during which two speakers angrily thrust a table at each other, illustrate that aggression, like tickling, requires two parties.