Proposal:
To 'mark our territory' as a planet in the universe to mark our existence and to possibly attract any intelligent life forms who may be curious of other extraterrestrials.

Passive vs. Active:
'Active' implies methods of contacting extraterrestrials by sending a probe to a chosen location. With this method, a specific message must be made and the designer must take into consideration the type of species the probe may or may not encounter. Once the probe is sent, it cannot be altered.
'Passive' implies methods of contacting extraterrestrials by sending a continuous message. The message we are proposing will be simple, just enough to draw the attention of other life forms. It doe snot require the knowledge of extra solar.

Ideas on How to Create a Signal:
_Background radiation, the background radiation from the creation of the universe is uniform.
_Sun, while the Earth is not visible from large distances, the Sun is.
_Nanotechnology
_Hitchhiker, 'tag' a comet, information will be attached and will be carried wherever it goes.

Parallels with the Lighthouse of Alexandria:
Beacon of the Greeks, erected in 300 BC, and served as a navigation marker. In the Song Dynasty (960-1279), the Chinese encountered the lighthouse. It served as a (representation) location of meeting cultures.