Many of you would think this is a foolish question, but I shall ask it regardless.
Once a summoning ritual to call upon magickal creatures is performed, how can you tell if something comes? Faeries, Dragons, sylphs and the likes cannot be seen, so how do you know if they answered your summons? Surely it's not as simple as visualizing them appear, right? Do they force an image of themselves into your mind, or do they require an inanimate object to make their presence know?