Eat, drink, be happy, and have children because one day we will all die.
We should also create something thats unique to our abilities.
It doesn't matter if we help to push a block up a pyramid, plant five trees in a row, build a house, write a book or create a painting. If we leave something behind that shows what we did here (besides creating kids), then we've created a small time capsule for others to see.
Even ideas can be time capsules. Ideas can spawn other ideas.
For all we know, the first table may have been built based on a joke made by cave dwellers sitting around a fire.
Most of the planet has tables to set things on. Someone had to have created the first one.

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I especially like the petroglyph's I see all around the southwest.
They may seem like childlike cartoons from people we may never understand, but, they are everywhere out here.
The Anasazi Indians created durable rock drawings that have lasted for thousands of years.
We are probably related to them and don't know it.