<s>
The	O
two-color	B-General_Concept
system	I-General_Concept
of	O
projection	B-Application
is	O
a	O
name	O
given	O
to	O
a	O
variety	O
of	O
methods	O
of	O
projecting	O
a	O
full-color	O
image	O
using	O
(	O
only	O
)	O
two	O
different	O
single-color	O
projectors	O
.	O
</s>
<s>
James	O
Clerk	O
Maxwell	O
first	O
suggested	O
he	O
had	O
discovered	O
such	O
a	O
projection	B-Application
system	O
,	O
but	O
it	O
was	O
not	O
reproduced	O
until	O
the	O
1950s	O
,	O
when	O
Edwin	O
Land	O
accidentally	O
noticed	O
a	O
similar	O
effect	O
while	O
working	O
on	O
his	O
three-color	O
system	O
of	O
projection	B-Application
.	O
</s>
<s>
Despite	O
Land	O
's	O
later	O
work	O
on	O
the	O
subject	O
,	O
the	O
physics	O
behind	O
the	O
success	O
of	O
this	O
system	O
of	O
projection	B-Application
(	O
and	O
similar	O
methods	O
of	O
apparent	O
full-color	O
projection	B-Application
involving	O
only	O
one	O
color	O
of	O
light	O
,	O
sometimes	O
in	O
different	O
polarizations	O
)	O
is	O
not	O
clearly	O
understood	O
since	O
it	O
involves	O
not	O
only	O
the	O
projected	O
light	O
but	O
also	O
the	O
human	O
visual	O
system	O
's	O
response	O
to	O
it	O
.	O
</s>
