Visual aids are very helpful in communicating biblical truth. God himself used many visual aids to teach us things about his person and his work.
Psalm 19 tell us that creation itself is like a huge visual aid that declares the glory of God. Jesus, when he walked the earth, referred to vines, flowers and fields to make a point. The altar and the cross are both places associated with death, and for the believer, they are reminders of the substitutionary work of Christ.
There are topics in the Bible, such as the Tabernacle of Moses, that are almost impossible to communicate without a visual aid. Yet the stories surrounding the Tabernacle provide foundational background to the New Testament.
Loved by young and old alike, visual aids bring important lessons to life, and help in comprehension and retention.