Alight upon
Definition 1 of 2
Pro Tip 1/3Sudden Realization
Used when emphasizing a sudden or unexpected idea or solution. 
Pondering the riddle, she alighted upon the answer quite by chance.
Pro Tip 2/3Creative Insight
Conveys finding creative or innovative thoughts like a flash of inspiration. 
While walking in the park, he alighted upon a unique theme for his novel.
Pro Tip 3/3Positive Surprise
Often suggests a pleasant or positive surprise when discovering something. 
Her eyes roamed the old bookstore until they alighted upon a rare find.