They may not fit into current legal categories, thereby challenging existing definitions. (coindesk.com)
When Rauschenberg first exhibited the Red Paintings and Combines at the Egan Gallery, New York, in December 1954, critics were baffled by the works, which challenged existing definitions of art. (rauschenbergfoundation.org)
The reply came under a lot of scrutiny from other redditers who argued that Cameron's position is vague at best, as bitcoin does not fit into existing definitions of what a currency should be. (coindesk.com)