This simplistic ritual is mostly for protection. I never really understood it more than just protection and there are far more elaborate ways to call on the four Corners. There are many ways to do this ritual, so just thought post how I did it in the beginning.

Usually set it up in a diamond, circle, or square pattern, have North, east, south and west.

It's best to acquaint yourself with four elements first, before calling upon them or at least has worked in my favor. Generally after you set up your circle.

I used a lot of collective river rocks to outline my circle, and different representations of North= Earth(bevy of rocks), East= Air(Chimes and open window), South= Fire(Candle), and West= Water( Bowl of water). Once my circle had been completed, I stood in the middle of the circle and turned to the north. I usually lined up the circle according to actual direction of north, east, south and west. Anyway to the north I went and don't quite remember what i would say to introduce myself. Something between respect and friendship of their power.

Afterwards, could turn to each element and call upon them. Usually I just say something like "I call upon the element to the north earth, please lend this circle your strength (attribute of earth), then turn to east, 'I call upon the element to the east, Air, please lend this circle your (attributes) and so on till done with all elements.

mostly I do this to meditate or if having a really trippy time after some inadvertent astral traveling. It helps me to sleep well and wake up with renewed energy. Before leaving circle however, it is mostly recommended to send away the elements. Turning to each as before, I usually say "I call to the element to the north earth, thank you for lending this circle your strength, you may stay or you may go, however you mote it to be, or wish it to be. repeat to all other elements.

That's about all I remember for now.

I don't need to place the circle any longer, just liked it as felt more connected to elements, energy works the same and elements as well.