Douglas Adams once observed: "Technology is a word that describes something that doesn't work yet."
By that definition, FIFA's Video Assistant Referee (VAR) system is a technological work of art.
VAR - which uses officials watching the action from a screen to advise the match referee - is being used at the Confederations Cup as part of a two-year trial but is already proving an unnecessary and infuriating distraction.
Two minutes elapsed, with no suggestion VAR had been utilised, before Slovenian referee Damir Skomina indicated the goal had been disallowed for offside.
When FIFA's official replay did come, five minutes into the second half, it showed the Chile striker may have had a toe in an offside position. It was that tight.
When the International Football Association Board (IFAB) agreed to the trial in March 2016, it was made clear VAR would only be used when the match official had made a "clear error".
It's quite conceivable the VAR overrule initially doused their fire, but credit Cameroon, who started to resemble, and play, like African champions after surviving an early onslaught.
It looked in the opening stages as though they would be overwhelmed by Juan Antonio Pizzi's vibrant side.
Michael Ngadeu Ngadjui had a header rightly ruled out for offside at the other end before Ondoa excelled again to parry clear an Edson Puch drive.
Chile looked deflated after the break and in need of a spark. Pizzi turned to Alexis Sanchez, fit enough only for a place on the substitutes' bench due to an ankle injury.
It worked as the Arsenal man dinked over a tempting cross from the left with 10 minutes to go and Vidal - the game's outstanding player - nodded home.
The goal was initially disallowed, but again VAR was called for due to doubts over whether Sanchez was onside.
Adams was right. This technological advancement is not ready. It doesn't work yet.
