Leary later went on to propose his eight circuit model of consciousness, in which he claimed that the human mind consisted of eight circuits of consciousness. He believed that most people only access four of these circuits in their lifetimes. The other four, Leary claimed, were evolutionary off-shoots of the first four and were equipped to encompass life in space, as well as expansion of consciousness that would be necessary to make further scientific and social progress. Leary suggested that some people may shift to the latter four gears by delving into meditation and other spiritual endeavors. An example of the information Leary cited as evidence for the purpose of the "higher" four circuits was the feeling of floating and uninhibited motion experienced by users of marijuana. In the eight-circuit model of consciousness, a primary theoretical function of the fifth circuit (the first of the four developed for life in outer space) is to allow humans to become accustomed to life in a zero or low gravity environment.

I love him lol LSD rules haha

In 1970, Leary was again convicted of possession of marijuana and was sentenced to jail. When Leary arrived in prison, he was given psychological tests that were used to assign inmates to appropriate work details. Having designed many of the tests himself, Leary answered them in such a way that he seemed to be a very conforming, conventional person with a great interest in forestry and gardening.

As a result, Leary was assigned to work as a gardener in a lower security prison.

In the months before his death from inoperable prostate cancer, Leary authored a book called Design for Dying, which attempted to show people a new perspective of death and dying.

Leary's book "The Psychedelic Experience" was the influence for John Lennon's song "Tomorrow Never Knows" on the Beatles' album 'Revolver.'
Leary was the explicit subject of the Moody Blues song "Legend of a Mind."
The Psychadelic Trance band Infected Mushroom uses a soundclip of Leary saying "Tune in, turn on, and drop out" in a song.

The term Timothy Leary tickets is an affectionate nickname given to the small squares of blotter paper to which liquid LSD has been applied. Presumably, this is because such tabs offer a "ticket" to a whole new show: a "trip" to lands hitherto unexplored.

Leary was the godfather of Winona Ryder, Uma Thurman (daughter of his ex-wife Nena).

President Richard Nixon had earlier labeled him "the most dangerous man in America."