Tarquin and Elara are standing on a flat field with a hot air balloon on the ground between them. They are on opposite sides of the balloon and cannot see each other. If the balloon starts to inflate and rise, what spatial changes will Tarquin and Elara experience in relation to the balloon?
Provide a very brief response.
As the balloon inflates and rises, it will initially obscure more of each person's view of the ground on the other side where the other person is standing. Once the balloon has risen enough, it will no longer block the horizontal line of sight between Tarquin and Elara at eye level. Then, depending on the size of the balloon and their distances from it, they may be able to see each other by looking over the top of the balloon as it increases altitude. The ascending balloon alters the spatial relationship by occupying more vertical space and less horizontal space from their respective vantage points, thereby potentially allowing line of sight over it once it is sufficiently elevated.