Possibilities from the Field of Actuality
Our choices lift a simple possibility from 1D into Infinite Dimensions...
There is a form that informs a Universe of possibilities. It is known as a Tetrahedron. It is the only complete form that's able to enter your 'bubble-like' context without breaking it. The first and smallest Platonic solid, the Tetrahedron has an inside and an outsideis.
In ancient cultures around the world it was symbol for fire. Its simple structure is readily used to build a fire, standing three dry sticks in a 'tee pee' like manner and placing combustionable material inside.
This form is easily identified in icons, pictograms, signs, symbols and glyphs as different cultural traditions the world over where time have layered its form with meaning.