Leary may be best known for his role in the psychedelic movement of the ’60s, but in his later years, at the dawn of the internet age he became fascinated by the potential of technology to transform human communication (see the related gallery on video games and other software from Leary’s archives). He also became interested in life extension and space migration, which he discussed in an exchange of letters with astronomer Carl Sagan.

Leary’s main message – and another one of his famous slogans – was to get people to think for themselves and question authority, said Denis Berry, a trustee of his estate. It’s a message that’s still relevant today, Berry said. “Let’s get out of the rut we’re unconsciously following, and start thinking for ourselves and living the life we want to live.”

It's interesting that he represents both thinking and drugs.

Since the 1980s thinking and drugs have not been compatible.

Crack and Crystal Meth, for example, do not expand the mind.