Possible Clues:

• Spot where parallel lines appear to converge
• Where one loses sight or night vision, nap restlessly
• The end of convergence somewhere in the Bermuda Triangle?
• Putting coat on, not having right bill? One may see this in perspective
• Indication of knife going in? It helps create a sense of perspective
• Result of bluntness? It helps one maintain a proper perspective
• Where parallel lines meet in perspective
• Fielder disappearing from view?
• Far out
• Where parallels may be drawn with a meeting, apparently