The objective is to situate the concept of appropriation and to find in what context it acquires significance. It is usual to relate it to all kinds of practices through which something or someone bears my mark and becomes mine. We propose to show that appropriation is achieved through various processes of identification which may or may not be linked to a practice. Strange power, almost infinite and yet almost bound to fail for in this undertaking, the other loses his otherness and becomes somewhat similar to us, unless we ima gine a world made of rebounds, of failures, of sparklings teht, from one difference to the next, would insure the continuity of saneness.