“On the Shulchan / Table you shall place Lechem Ha’panim [literally, ‘bread of faces’] before Me, always.” (25:30)
Rashi says It had surfaces or faces. A person was able to almost see himself in the bread. How one looked at the bread, is the way the bread appeared to the person. If he looked at the bread with belief and a pure heart then the person saw the miracles of the bread. A week after it was placed on the table, it was still ‘hot out of the oven’.
If on the other hand a person looked at the bread as a non-believer and with a cold heart, then the bread appeared as old spoiled moldy bread. Rashi says in Parshas Emor about the person who cursed Hashem he made fun and said isn’t it normal for a king to eat fresh bread every day, should he eat cold nine-day old bread? He was only able to see old spoiled moldy bread. (Admor MiGur)