The temperature
It could also be a piano scale or a staircase.
An Elevator
roads?
an elevator
TV channels
AN OLD MOTHER TRUCKER
An elevator, escalator?
Our Age!
The temperature It could also be a piano scale or a staircase.
rain goes down, but never goes up actually it evaporates is transformed to water vapor goes into the clouds and eventually comes down as rain again (pixilated)
Your age.
Your diaphragm moves downward during exhaling.
Anything that moves can the real answer to the riddle is carpet