UNKNOWN PIECE is an Andre Uerba's project embodied by performer Yann Gibert.
This piece works on the paradox of its inexistance through two interrelated steps:
the performance|the documentation

Previously imaginated as clandestin happening inside the very
institutional Lisbon Artfair, U.P. is the 1h30 hours long visiting of an
exhibition by an integrally black Spandex dressed artist, 1.92m high
(yann gibert).
This perfectly light-absorbing body creates in the time frame of its
recieving event, a space in a visual and symbolical manner.
The dialectic of presence/absence, shown/hidden (quiet
characteristical of Andre Uerba's body of work), emphasis the
fictionality of official culture celebration as being considerated
"public event".
If the very first interpretation of this speechless appearance is
suggesting an absent artist taking part to the exhibition as kind of
simple visitor, a second reading can lead to a more obvious "ghost
visitor" image, questioning the legitimacy of cultural consumers that
are present face to a significativly un-visible one.
Set in such a context, this image won't give a clue about its inner
socio-political meaning. Is it about facing an artist? Or a simple
visitor? Or a black hole? Or a super heroe? It's up to the viewer to
make up is mind...

While the performance creates a mesmerizing link between the
exhibition content and the visitors, its video documentation, for
viral use, allows a unique kind of visit, where the fictionallity of
the action provides a spectacular perspective in the observation of
the event promoting the exhibition as lively, suprising and visualy
attractive moment in local cultural life.