It goes up, but at the same time goes down.
Up toward the sky, and down toward the ground.
It's present tense and past tense too.
Come for a ride, just me and you.
What is it?
Check Braingle.com for the answer.
from Braingle's Teasers http://ift.tt/1fYO2jw
via 3d wooden brain teasers from craftypuzzles.com