We tend to believe in what we can see with our own eyes, or even better, what we can touch. But if we cannot see or touch it, does it exist, or is it an illusion?
Take the gods, for example. Are they abstract or real? Have we ever seen them? Have we ever touched them?
There are two options: either you believe in something even though it is immaterial, or you do not believe because direct contact with reality is missing.
What about ebooks or streaming music? We cannot turn the pages of those books. We cannot smell the paper. We cannot dust the delicate surface of a vinyl record. We cannot place CDs or records or books or comics on a shelf to admire and rejoice in our collection.
So, do ebooks or streaming music really exist?
Of course they do! They represent a different reality. You just have to believe in it.