The concept of the exhibition is based on the ideological convergence of the work of Catherine Radosa and Jaroslav Varga, which consists in revealing the physical and symbolic traces of the past. Both artists examine these relics of bygone times and eras from the perspective of collective memory and the mechanisms of its storage. A vacant lot is an empty space, a gap left by a past situation that can be filled again. The installation Colonne / Révolution captures the constant cycle of the monument in a triple projection. The period of the revolutionary Paris Commune is still a problematic period in France, similar to the period of socialism in our country: it has been and continues to be reinterpreted, tabooed, or marginalized.