Man with Head Upwards and Feet Upwards

Problem

How may a man have his head upwards and his feet upwards at the same time?

Solution

When he is situated at the center of the Earth.

$\blacksquare$

Historical Note

This puzzle is typical of those found in collections of Victorian amusements.

Sources

• 1633: Henry van Etten: Mathematicall Recreations (translated by William Oughtred from Récréations Mathématiques)
• 1992: David Wells: Curious and Interesting Puzzles ... (previous) ... (next): Henry van Etten: $117$