Futuristic Parking Sensors on 18th St?

Diligent reader mo kaze noticed that “they” glued in blue discs on 18th Street and thoughtfully snapped a pic for our consideration.  I am assuming that “they” refers to DPW officials and not aliens disguised as public officials detectable only by XRAY specs.

What do you think, readers?  Futuristic parking sensors or viral marketing campaign for the new TRON movie?  If the former, no word yet on whether or not they register pedestrians standing in parking spots and holding them for their friends’ vehicles.

UPDATE!!!

Looks like the future is here!  SFpark has the scoop . . .

Previously:

Okay for Pedestrians to Occupy and Hold Parking Spots?