Trompe-l’œil:
Trompe-l’œil (/trɒmpˈlɔɪ/ tromp LOY, French: [tʁɔ̃p lœj]; French for ‘deceive the eye’) is an art technique that uses realistic imagery to create the optical illusion that the depicted objects exist in three dimensions. Forced perspective is a comparable illusion in architecture. [Wikipedia]
Noted in “How did this teenager’s drawing of his knee wind up in a Jasper Johns painting at the Whitney?” Geoff Edgers, WaPo:
On May 25, [17 year old student Jéan-Marc] Togodgue, [Rita] Delgado and [Jeff] Ruskin took [artist Jasper Johns] up on that offer and made the short drive down Route 41 to the artist’s nearly 170-acre estate. They were met by Johns, assistant Maureen Pskowski and Conley Rollins, a former Goldman Sachs asset manager who now owns an inn and often serves as an unofficial representative of the artist. Togodgue stared at “Slice” and his drawing, which appeared to be taped to the canvas. Then he looked closer. It was a perfectly executed trompe l’œil; the tape was actually paint. Johns had also reproduced the image exactly, right down to the Jéan-Marc signature, a creation as distinctive as a graffiti artist’s tag.