at the age of twenty i had my first time machine, mostly from stuff i had picked up from ancient mayan calendars and architecture, the concept was complex but functional. machines couldn't really fold space but the mind can. i'd outsourced the mathematics to a small team of peers, nerdish math geeks who had always been sympathetic to my passions. these geeks were to frightened to take hallucinogens but loved the idea of me reporting my experiences to them. they were drawn in by the hard chemistry writing's of alexander and ann shulgin and the time wave zero theory of terrance mckenna as i explained it to them in my non mathematical way. they speculated that the universal teleological attractor could be accessed by the pineal gland under the right circumstances, a gnostic approach that incorporates some mathematical models with the cosmological constant. 
at this point everything would happen simultaneously, time would no longer occur as we understand it, the i ching would determine the time lines i could travel along from this point to others.
i'd spent about four years working out various dosages of mushrooms but dmt was far more effective and accessible, it's in our national emblem the wattle for gods sake. 
my task had been working on dose while the team worked out trajectory via trigram.
together we figured the trigrams matched certain epoch defining events that match the change in conciousness according to mayan prophecy.
for example trigram 1 the creative force would take me to the birth of the universe. from then on it was tricky to know exactly where these focal points would occur, for example t6 would have to be the 1st or 2nd world wars, the moving lines may chart a tangential course towards a defined point within that period, there were inner and outer aspects plus the added complication of the wilhelm interpretation vs the modern, the wilhelm gave us more control so they stuck with that.
there are side effects, i mean nothing is certain, we can only estimate the trgram with the position in time and space and i have made mistakes. it's an imperfect process and fundamentally eastern, the western mind is at a disadvantage, our history is focused permanently upon colonial matters, western interpretations, philosophy.