Unveiling the Mystery: Why 'X' Marks Appear on Glass Doors and Windows

• Transparent glass in new buildings poses a safety risk, as people might not see it and walk into it.
• The 'X' mark warns workers carrying heavy objects about the presence of glass, preventing accidental damage.
• Many countries mandate glass door markings (Glass Manifestation) for safety regulations.
• The 'X' mark helps break the habit of walking through an empty space, preventing accidents after glass installation.
• These marks are temporary, later replaced by design stickers or company logos.