The media most commonly used in scrying are reflective, refractive, translucent, or luminescent surfaces or objects such as crystals, stones, or glass in various shapes... mirrors, (reflective) surfaces.
Scrying media generally either suggest images directly... or else they distort or reflect the observers' vision confusingly, in the manner to be seen in crystals... Such fancies have long been satirised by sceptics, for example in Hamlet III.ii:
Do you see yonder cloud that's almost in shape of a camel?
By the mass, and 'tis like a camel, indeed.
Methinks it is like a weasel.
It is backed like a weasel.
Or like a whale?
Very like a whale.
One class of methods of scrying involves a self-induced trance, with or without the aid of a medium such as a crystal ball or, even via modern technology such as a smartphone among other things.
“My wish is that we continue to increase levels in our immigration system for refugees. I’m very open to saying that, and I will do whatever I can, in whatever position I am in, to continue to push for higher refugee numbers every single year,” - Ahmed Hussen, Canada's Liberal Immigration Minister