Observer is a nestable block element. You can put any elements at it, like you would do at a Breakdance div or section.
Observer will observe user’s cursor position at the page, including cursor’s movements and scrolling.
Observe: the element that will trigger the observe effect when it is hovered. It is the body by default.
Constrain: the constrain to apply when observing.
Perspective: the constrain to apply when observing.