Looking for ideas for my current cutie mark

[SeaSkies]

don't know if you're still thinking about things, you seem to have it worked out as a lightbulb but i figure my 2 cents can be ignored is nessisary, anyway, hwn i think of the word Eureka i think of Archimedes. If you don't know (which i'm sure you do but heres some backstory just in case) he was a Greek scholor who was hired to find out if the king's crown was made of pure gold or if it had other metas in it making it less valuable. Anyway Archimedes discovered how to mesure this (without pulling the crown apart) by stepping into a full bath or water and having it flow out - the whole water displacement thing, then he cried out "Eureka" and went and sorted out the king by the estimated weight of how much a pure gold crown would displce water. So - long story short - maybe some water and a crown ?