Aperture Science logo with robot

1680 × 1050

Portal turret scene

1920 × 1080

Yellow Warning Sign — Dramatic, Digital Art

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Yellow Warning Sign — Dramatic

1920 × 1080

Dubstep Zone Warning Sign

1920 × 1080

Red Warning Tunnel

1366 × 768

Black Textured Background — Warning

1920 × 1080

Yellow and Black Stripes — Warning

1920 × 1080

Radioactive Warning Symbol — Yellow, Dramatic

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Keep Clear Sign

1920 × 1080

Creeper Sign

1680 × 1050

Robot Holding Sign

1920 × 1080