Related:

• Absence of evidence is evidence of absence of proof.
• Anarchy is not the absence of power, it is the absence of force.
• Absence of Evidence is not Evidence of Absence -- UFO expe
• Why be NoRmAl?
• If you're normal, who wants to be normal?
• Absence makes the heart forget.
• We prefer to believe that the absence of inverted commas guarantees the originality of a thought, whereas it may be merely that the utterer has forgotten its source.
  -- Clifton Fadiman, "Any Number Can Play...
• Chronometer: Precision instrument which registers sharp impacts by displaying a telltale spiderweb pattern on its glass face
  by the absence of a normal ticking sound when held to the ear, or by the presence of small, loose pieces moving around within its case when shaken....