The human brain is amazing
YouTubers Scam School have shared the simple way to make your brain hallucinate using something called the Ganzfeld Effect.
Basically, all you need to do is take a sheet of white paper and cut it into the shape of a blindfold. Then pop on some headphones and play some uninterrupted noise (i.e. TV static) and within 10 to 30 mins, you should be hallucinating.