There are plenty of ways to trick your mind without using chemical substances.
Here are two things you can do at home. You might have heard of them or tried one of them as a child. Guaranteed to entertain you.
upside down world
Wanna turn your world upside down?
1) Find a mirror, it should be about the size of your palm, bit smaller or bigger is ok too.
2) Hold it with both hands and place it straight and right under your nose. Resting your nose on it.
3) Look down, and keep looking down.
4) Start walking.
5) Do it at least for 5 continious minutes without looking away or removing the mirror or best effect.
Before you know it, you'll be stepping over invisible thresholds and walking on your ceiling.
P.S Clear away obstacles before you start exploring and do NOT do this outside or in traffic(!).
Take out a pair of headphones (important).
Make sure that you have the L and R markings on the headphones placed on your LEFT and RIGHT ear. Quite important.
Make sure you're in a calm environment and that you have time to spare. Close your eyes and press start!