1. An unobserved and uninteracting observer
   "I'd love to be a fly on the wall when they meet"

Encyclopedia: Fly on the wall

• common foxglove
• common fraction
• common front
• common garden cress
• common garter snake
• common ginger
• common good
• common grape hyacinth
• common grape vine
• common ground
• common gum cistus
• common heath
• common hop
• common hops
• common horehound
• common horsetail
• common hyacinth
• common iguana
• common iliac artery
• common iliac vein
• common ivy
• common jasmine
• common juniper
• common kingsnake
• common knowledge