Observing on the window pane
A fly that slowly seemed to glide,
Against the landscape rush outside:
How can it be? The train quite swiftly goes,
And yet the fly is very slow,
While I am moving not at all?
It can only make some sense
If you know the “frames of reference...”
There is no such thing as single “speed”
That everyone can use at leisure,
Unless you've figured out, indeed,
Against which the speed you'll measure!”
Like speed, so does intelligence
Require a “frame of reference,”
And if you have a clever brain.
The Universe you can explain...