<s>
A	O
pinspeck	B-Algorithm
camera	I-Algorithm
is	O
the	O
optical	O
reverse	O
of	O
a	O
pinhole	B-Algorithm
camera	I-Algorithm
:	O
a	O
small	O
(	O
point-like	O
)	O
obstruction	O
(	O
the	O
speck	O
)	O
is	O
placed	O
in	O
front	O
of	O
the	O
film	O
where	O
the	O
(	O
pin	O
)	O
hole	O
would	O
be	O
in	O
a	O
pinhole	B-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
Whereas	O
in	O
a	O
pinhole	B-Algorithm
camera	I-Algorithm
the	O
hole	O
allows	O
rays	O
of	O
light	O
from	O
different	O
parts	O
of	O
the	O
scene	O
to	O
reach	O
different	O
parts	O
of	O
the	O
film	O
,	O
the	O
obstruction	O
in	O
the	O
pinspeck	B-Algorithm
camera	I-Algorithm
causes	O
the	O
shadow	O
of	O
different	O
points	O
in	O
the	O
scene	O
to	O
fall	O
on	O
different	O
points	O
on	O
the	O
film	O
.	O
</s>
