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That's a shot of the winning design of the Tour Signal, by Ateliers Jean Nouvel. A competition was held to reinvigorate Paris' La Defense neighborhood:

This project's ambition is to create a strong hub at the heart of the Greater Paris region, creating a significant draw at the same time as establishing a relationship between the project and its natural and built-up environment, embodying the various temporal considerations which strengthen the links between a project and its environs.

Details of Nouvel's winning design, for a 71-storey tower, are available here, and a look at the other competitors' work--all impressive--can be seen here.

via dezeen