BGS 2013: David Singmaster about Vanishing Puzzles

Metagrobologist David Singmaster made a nice presentation about an old subject: Vanishing Puzzles.

Here's a simple one where we move a piece of the puzzle and the original egg disappears:

David Singmaster brought lots of puzzles and old book references.

Here is a part of a page from Sebastiano Serlio - The First Booke of Architecture from 1611 (!) where it says that we can cut a table in a way to increase its area:

Another old reference is Davis Hooper's Rational Recreations, volume 4, from 1782:

And a 19th century French puzzle with the same theme:

Sam Loyd also made some famous vanishing puzzles:

I remember this next one from my youth, here in Portugal:

Other ones:

update: here's a Geogebra application of Loyd's Get off the Earth