One pill makes you larger, and one pill makes you small
And the ones that mother gives you, don't do anything at all

Go ask Alice, when she's ten feet tall

And if you go chasing rabbits, and you know you're going to fall

Tell 'em a hookah-smoking caterpillar has given you the call

And call Alice, when she was just small

-White Rabbit-Jefferson Airplane

The red pill and its opposite, the blue pill, are popular cultural symbols representing the choice between:

Knowledge, freedom and the (sometimes painful) truth of reality 

The terms, popularized in science fiction culture, are derived from the 1999 film The Matrix. In the film, the main character Neo is offered the choice between a red pill and a blue pill by rebel leader Morpheus. The red pill would free him from the enslaving control of the machine-generated dream world and allow him to escape into the real world, but living the "truth of reality" is harsher and more difficult; on the other hand, the blue pill would lead him back to stay in the comfortable simulated reality of the Matrix.

In order to experience art fully, the viewers must go through a mini ego death by placing themselves in the inspired mind of the artists, who themselves are out or their minds and only acting as channels of the creative spirits

-Alex Grey

So in order to symbolically jack-in to my world, I am kindly asking you to take the red pill