Little Chell in Portal 2

We are introduced to the Silent but active test subject known only as Chell in Portal, and the game ends when Chell destroys Glados and the Aperture science lab. We meet Chell again in Portal 2. This game though has a clue about Chell's past and her previous involvement with the Aperture science lab. It turns out Chell was a daughter of a Aperture science lab employee because Chells name can be seen in one of the children's projects showcased at "Bring your Daughter to work day" held sometime in the past at the science lab. The potato in little Chells potato battery, has grown through the roof leaving a distinct mark on the Aperture science lab, showing a similarity to the impact Chell has on the Aperture science laboratory.

notice Chell's name on the bottom right corner..