Related to Portal caution sign

Stick Figures with Ninjas

3360 × 1050

Person Escaping Ninjas — Gray

1680 × 1050

Robotic Spheres

1369 × 1133

Person Escaping Ninjas

1680 × 1050

Aperture Science Facility

1920 × 1080

Portal Device in Test Chamber

1920 × 1080

Aperture Laboratories Logo — Black, Dramatic, Digital Art, Text, Blue

1280 × 1024

Aperture Laboratories Logo — Black, Dramatic, Digital Art, Text, White

1920 × 1020

Companion Cube — Green

1920 × 1200

Cave Johnson's lemon rant

1920 × 1080

White Cube with Heart Symbols — Gray, Dramatic

1920 × 1080

Stick figure climbing over wall

1920 × 1080

Cave Johnson quote from Aperture

1440 × 900

Blue Aperture Symbol

2560 × 1600

Ninjas and portals

1366 × 768

Blue Screen Error — Dramatic, Digital Art

1600 × 1200

Ninjas vs Companion Cube

1280 × 1024

Aperture Laboratories Logo — Black, Dark, Digital Art, Text, Green

1440 × 900

Person Escaping Ninjas — Gray, Humorous

1680 × 1050

Companion Cube with Heart — Pink, Playful, Illustration

1366 × 768

Silhouette Ninjas with Portals

1280 × 800

Person Using Portals — Gray, Humorous

1280 × 1024

Cube with Heart Symbols — Beige, Neutral

1280 × 1024

Cake Slice with Cherry

1440 × 900