Pluto and the Eight Planets. I created this icon set as a tribute to Pluto in the wake of the little planet's demotion to "dwarf planet" — and the subsequent demise of my childhood faith in the never-changing facts of the Cosmos. What will the celestial mother serve on her mnemonic table now in place of those nine pizzas?
This exercise involved figuring out the key identifiable physical attributes of each celestial body; experimenting with silhouettes and patterns; and simplifying them into entities that could each be easily recognized on their own — the most difficult distinction being of course the famous Pluto itself and its mirror/bookend planet Mercury.
RIP, little one.
July 2015 update: Newly acquired hi-res photos of the elusive Pluto have finally given us some recognizable physical features to work with. Stay tuned for future updates!