They're not dead, after all, just departed to the other side. Icons surround us to remind us of all the saints who are joining us invisibly in worship. The three doors. Every Orthodox church will have an iconostasis before its altar. In a more established church, the iconostasis may be a literal wall, adorned with icons.
Some versions shield the altar from view, except when the central doors stand open.
The basic set-up of two large icons creates, if you use your imagination, three doors. Only the priest and deacons, who bear the Eucharist, use the Holy Doors. Altar boys and others with business behind the altar use these, although no one is to go through any of the doors without an appropriate reason. Females are invited to participate in every other area of church life. Not at all.