It's not about "conventional" or "modern". By definition, current flows from Positive to Negative. The fact that the majority carries in a piece of wire happen to be electrons is not relevant.
As my general science teacher explained back in 1952!
this is the real photo
here as you can see all these vertical lines are not connected to each other.
You circled an horizontal line
yes, but the board itself is rotated to 90 deg so technically it's vertical
OK an alternate vertical definition then:)
from the look of it, I would say it's like this for each of the 4 breadboards plus the "power rail" (probably meant for that) that is at the top.
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