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Across 3. Two lines that converge together providing a depth cue (6,11) 4. Filling in missing gaps with an image 9. Amount of detail present in surfaces (7,8) 12. Objects that overlap one another 13. Changing shape of retina so eyes can focus on different objects 14. The objects shape is changed by the retina (5,9) 15. Being perceived as a group

Down 1. Object perceived as being the same no matter the orientation (11,9) 2. Blending together of two different images received by each retina (7,9) 5. Objects stand out against less distinct objects (6,6) 6. Two or more things coming together 7. The size of the image cast on the retina (8,4) 8. Objects look similar causing people to see them as a group or pattern 10. Rendering technique based on distance from view point (5,4) 11. Size of the object is changed by the retina (4,9)