Find by chance; notice:her eyes alighted on the item in question...
His gaze alighted on the journalist Eleanor Mills, by chance the stepdaughter of a Cabinet minister.
He briefly alights on the historical context of Mongolian expansionism.
His hand alights on the Virgin Mother in her blue robe; his thumb presses feverishly over the contours of her face and form, then freezes as recognition of some kind descends.