<s>
In	O
the	O
field	O
of	O
user	B-Application
interfaces	I-Application
,	O
an	O
endocentric	B-General_Concept
environment	I-General_Concept
refers	O
to	O
a	O
virtual	B-Application
reality	I-Application
or	O
some	O
other	O
immersive	O
environment	O
which	O
is	O
introduced	O
directly	O
into	O
the	O
user	O
's	O
senses	O
(	O
for	O
example	O
by	O
using	O
VR	O
goggles	O
)	O
.	O
</s>
<s>
Systems	O
which	O
display	O
a	O
virtual	B-Application
reality	I-Application
indirectly	O
to	O
the	O
user	O
(	O
for	O
example	O
by	O
placing	O
the	O
viewer	O
in	O
a	O
room	O
made	O
up	O
entirely	O
of	O
rear	B-Device
projection	I-Device
screens	I-Device
)	O
do	O
not	O
qualify	O
.	O
</s>
