Model Toward a Theory of Cognition

by Hans Magnus Enzensberger

Here is a box for you,
a large box
labelled
Box.
Open it, 
and you will find
a box in it,
labelled
Box from a box
labelled Box. 
Look into it
(I mean this box now,
not the other one),
and you will find a box
labelled
And so on,
and if you go on
like this,
you will find,
after infinite efforts,
an infinitely small
box
with a label
so tiny
that the lettering,
as it were,
dissolves
before your eyes.
It is a box
existing only
in your imagination
A perfectly empty
box.