The International Experimental Workshop for Bio-digital city is invited to the night of ideas 2018. This global event, initiated by the French Institute, is relayed in more than 50 countries. The City of Science and industry participates in this event, with a program called "I imagine Tomorrow", sponsored by Etienne Klein, physicist, philosopher of science. The program : discussions and presentations of work. Claire Bailly and Jean Magerand were invited to open and host a debate on the theme "Smart city, Ideal city?". This intervention is the occasion of an article published by The conversation, partner of the event. Throughout the evening, the work of the Experimental Laboratory (Universcience Partnership/International Experimental Workshop for Bio-digital city) is presented to visitors.   Watch the video of the debate: