A Failed Trick

Around few rising bubbles
A pair of fish whirls
They see everything
With their big unblinking eyes
But I am suspicious
Are they aware of their containment,
Or they are tricking me? 
Mocking me with pseudo unawareness?

Because at a single touch 
on the glass
They rush towards the spherical corners
And disappear for a moment
Then a moment longer.
And now only the rising bubbles, 
Make the scene inside

How do they know this trickery? 
Did somebody teach them?

I sat there, longer
And waited. 
But they hid themselves
In an oblivion inside

Why they did this? 

Was it,

Just like they disappeared for me

I disappeared for them?