Is time linear? Is it like this waterfall? Does the future rush towards us, the present pour past us in a constant stream, and the past disappear into the far distance carrying the our daily experiences off into the vast oceans of memory?
Or is it more like a tree?
Does time accumulate, like the growing sapwood just under the bark, laying down this year’s experiences on top of last years, each and every ring layered over the previous ones?
Does the present grow out of the past which doesn’t disappear, but which perpetually lies beneath us, our daily experiences emerging from, growing from, all that has occurred before?
Heroes Not Zombies 
Time, like a tree or a river? The question reminded me of T S Eliot’s famous lines: (1944)
“At the still point of the turning world….neither from nor towards….Except for the point, the still point….There would be no dance, and there is only the dance.”
Does that suggest that time has no past, no future – time is only ‘the still point’ now? The time to dance is now!