… and come away with a chest of Blood. Artist Sebastian Errazuriz suggests that his supply of vino was …
inadvertently blessed by the priest while turning wine into the blood of Christ during the Eucharist.
Well, no. It doesn’t work that way.
But the making of wine popsicles on a crucifix stick, that’s slightly clever. On the other hand, I prefer my wine chilled and white, not frozen.
Catholic Sensibility 
I was under the impression that it was like d20 rules, in that it’s whatever is in visual range (i.e. the altar) of the priest?
No, it is whatever wine and bread the priest INTENDS to consecrate. Usually, the priest would intend to consecrate the elements that are on the altar, or perhaps, more narrowly, on the corporal.
Gotcha, thanks. I have to admit, though, that d20 rules would be way cool.
Correct. Otherwise, the priest would be consecrating all the wine in the sacristy, too.