Brain Teaser

[Orangeclawhamme]

Someone brought some brain teasers to a party that I attended. He did not have the answers for them, but we were able to figure out all but one of them. Here is is

i i
o o
o o
o o
o o

Any ideas?

thanx,

[VroomVroom]

Don't stare at that too long....you may get circles under your eyes.