notion of other worlds (continents, moon, planets, solar systems, flat worlds etc.)
there is often a technology allowing one to "translate" between these worlds (ships, spaceships, wormholes, farcasters, ansible etc.)
zooming / scaling of the world (micro-, macro-)
less or more dimensional spaces
spaces with special topology (e.g. cycles, mobius strips); limits / borders of space
new sources of energy / new access to known sources of energy (nuclear fusion, rain energy)
new means of storing energy
other forms of energy (e.g. Elan Vitale, Force, Kundalini u.s.w.)
devices whose operation contradicts the Laws of physics (perpetuum mobile)
energy sleeping, energy waking up
too much energy, too little energy, energy disappearing
parallel worlds / universes / multiverses
uchronias / alternative history worlds
dreams, hallucinations, psychoses, altered states of consciousness
post-death, pre-birth / previous lifes
virtual reality, simulations
story worlds
time slow-down / time acceleration
time dilation
time machines and time loops
pre-cognition and post-cognition
reversal of 2nd Law of Thermodynamics / axis of time
mismatch between subjective and objective time
transcendence beyond time