Place a half-opened penknife on the edge of the table and hang a large
cooking-spoon by its hook on to the knife, just where the blade and
handle join. Place the spoon so that its inner (concave) side is
facing the table and, after swinging for a little while, the knife and
spoon will keep still in perfect balance. Even if you fill the spoon
with sand it will not fall, so long as the heaviest point is under the
edge of the table.
The cooking-spoon is hung on to the half-opened penknife where the
blade and the handle join, and you can now place the end of the
knife-handle on the tip of your finger, on the edge of the table, or
on the rim of a glass which is standing near the edge of the table,
and your knife and spoon will balance perfectly, without falling over.
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