But only if you're under twenty

Walk along a beach,
any beach any country
And pick a metre square of sand
Then paint a pen picture of what you see
SAND!!!!!!
Yes sand, simple really

Now, go back tomorrow
Same time and same patch of sand
SAND,!!!!!
Yes, sand. Yep you got it
Paint a pen picture of what you see

Now if you really looked at that patch of sand
The picture you painted today
Will be completely different from the picture
You painted yesterday

Simple, don't just look but look and see