<s>
A	O
Bob	O
(	O
contraction	O
of	O
Blitter	B-Device
object	I-Device
)	O
is	O
a	O
graphical	O
element	O
(	O
GEL	O
)	O
used	O
by	O
the	O
Amiga	B-Device
computer	I-Device
.	O
</s>
<s>
Bobs	O
are	O
hardware	O
sprite-like	O
objects	O
,	O
movable	O
on	O
the	O
screen	O
with	O
the	O
help	O
of	O
the	O
blitter	B-General_Concept
coprocessor	B-General_Concept
.	O
</s>
<s>
The	O
AmigaOS	B-Application
GEL	O
system	O
consists	O
of	O
VSprites	O
,	O
Bobs	O
,	O
AnimComps	O
(	O
animation	O
components	O
)	O
and	O
AnimObs	O
(	O
animation	O
objects	O
)	O
,	O
each	O
extending	O
the	O
preceding	O
with	O
additional	O
functionality	O
.	O
</s>
<s>
While	O
VSprites	O
are	O
a	O
virtualization	O
of	O
hardware	O
sprites	O
Bobs	O
are	O
drawn	O
into	O
a	O
playfield	O
by	O
the	O
blitter	B-General_Concept
,	O
saving	O
and	O
restoring	O
the	O
background	O
of	O
the	O
GEL	O
as	O
required	O
.	O
</s>
<s>
Bobs	O
require	O
more	O
processing	O
power	O
than	O
sprites	O
,	O
because	O
they	O
require	O
at	O
least	O
one	O
DMA	B-General_Concept
memory	O
copy	O
operation	O
to	O
draw	O
them	O
on	O
the	O
screen	O
.	O
</s>
