glimmer in (someone's) eye

Translations
задумка в (чьих-то) глазах
When the company started, it was just a glimmer in the CEO's eye.
Когда компания начинала, это была всего лишь задумка в глазах генерального директора.
Definitions
A 'glimmer in (someone's) eye' refers to an idea, plan, or person that is only just beginning to form or exist, often used to describe something at its earliest stage of conception. It is commonly used to refer to a child before they were born or even conceived, as in 'when you were just a glimmer in your father's eye.'