<s>
Head-coupled	B-Algorithm
perspective	I-Algorithm
is	O
a	O
technique	O
to	O
show	O
3D	O
imagery	O
on	O
2D	O
devices	O
.	O
</s>
<s>
The	O
perspective	B-Architecture
of	O
the	O
scene	O
on	O
the	O
screen	O
is	O
based	O
on	O
the	O
position	O
of	O
the	O
user	O
’s	O
eyes	O
,	O
simulating	O
a	O
3D	O
environment	O
.	O
</s>
<s>
When	O
the	O
user	O
moves	O
their	O
head	O
,	O
the	O
perspective	B-Architecture
of	O
the	O
scene	O
changes	O
,	O
creating	O
the	O
effect	O
of	O
looking	O
through	O
a	O
window	O
to	O
the	O
scene	O
instead	O
of	O
looking	O
at	O
a	O
flat	O
projection	B-Algorithm
of	O
a	O
scene	O
.	O
</s>
