Fourth Dimension

Today I gave a lecture out of town. During the drive I shot some frames (my wife was driving), of which this is the aptest (can you say that? Apt, apter, aptest)

Took me a while to figure it out. It's a traffic sign showing the speed limit, this
time 100 km/h. This slow shutter creates the 4D timeline .

The darn thing knows how to switch between 100 and 120 km/h.

PS Cats may be back tomorrow