A flying object appeared in the sky, flying like an airplane. It then hovered, moved horizontally left, hoverered again, then moved horizontally right out of sight. My family was enjoying an evening dessert run at a coffee shop overlooking the city. A flying object slowly appeared in the sky over the city. Initially, I thought it was an airplane, but noticed the object was not flashing like a commercial airplane. All of a sudden, the object, which had been emitting a blue color, turned green. The object hovered in place, then moved horizontally left, hovered again, then moved horizontally right out of sight past the palm trees. I'm honestly not sure if this was a drone or something from out of this world.