Pigeonhole principle
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In mathematics, the pigeonhole principle states that if n items are put into m containers, with n > m, then at least one container must contain more than one item. For example, of three gloves, at lea
Pigeons in holes. Here there are n = 10 pigeons in m = 9 holes. Since 10 is greater than 9, the pigeonhole principle says that at least one hole has more than one pigeon. (The top left hole has 2 pigeons.)
Pigeon-hole message boxes at Stanford University
Dovecote
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A dovecote or dovecot, doocot or columbarium is a structure intended to house pigeons or doves. Dovecotes may be free-standing structures in a variety of shapes, or built into the end of a house or ba
Pigeonhole principle
…the more pictorial interpretation, literally involving pigeons and holes. This suggestive (though not misleading) interpretation of "pigeonhole" as "dovecote" has lately found its way back to a German back-translation of the "pigeonhole principle" as the "Taubenschlagprinzip". Besides the original terms…
Dovecote at Nymans Gardens, West Sussex, England
A dovecote in Najafabad, Iran
Pigeon tower in Kavastu, Estonia (built 1869)
Pigeon houses in Isfahan, Iran