It's an interesting question!

Any visual-related presentation that depends on color is sort of out of the question (because the color spectrum visible to humans may be imperceptible to another species, let alone a non-carbon based life form). Same thing with sound. How do we know that the range of sound waves audible to humans is meaningful to the forms of life that receive this package? On the other hand, these specific ranges of light and sound waves tells something essential about how (many) humans perceive reality.

The same goes for our experience of time, and how we perceive time and motion. So I'd propose the following three items:

• A photo book of the Earth, including images of nature, humanity, our cities, cultures and food, printed in black and white.
• The same photo book, printed in color.
• The same photo book, as video clips on a tablet, with sound.

And if we can send more than three objects, I'd also suggest sending the Fibonacci sequence, etched in metal in both binary and base 10, with an image of human hands.