Read the poem and answer the following questions.

maggie and milly and molly and may
went down to the beach(to play one day)

and maggie discovered a shell that sang
so sweetly she couldn't remember her troubles,and

milly befriended a stranded star
whose rays five languid fingers were;

and molly was chased by a horrible thing
which raced sideways while blowing bubbles:and

may came home with a smooth round stone
as small as a world and as large as alone. (10)

For whatever we lose(like a you or a me)
it's always ourselves we find in the sea

Which figure of speech is used in line 10? 

Simile

'as small as a world' is an example of simile