headcanon: after even drew that heart for the first time in 3x08, it became a thing™. ever since that fredag whenever one of them is waiting, the other draws a heart onto the glass upon arriving. it’s totally a thing™
It’s a popular belief each brain hemisphere provides a different set of functions, behaviors and controls. The right hemisphere is considered the “creative” side, while the left is called the “logical” side. Geniuses are said to use both hemispheres equally.