An impossible bottle is a bottle containing an object that does not appear to fit through the bottle's mouth.
The ship in a bottle is a traditional and the most iconic type of impossible bottle. Other common objects include fruits, matchboxes, decks of cards, tennis balls, racketballs, Rubik's Cubes, padlocks, knots, and scissors. These may be placed inside the bottle using various mechanisms, including constructing an object inside the bottle from smaller parts, using a small object that expands or grows inside the bottle, or molding the glass around the object.
Ship in a bottle
There are two ways to place a model ship inside of a bottle. The simpler way is to rig the masts of the ship and raise it up when the ship is inside the bottle. Masts, spars, and sails are built separately and then attached to the hull of the ship with strings and hinges so the masts can lie flat against the deck. The ship is then placed inside the bottle and the masts are pulled up using the strings attached to the masts. The hull of the ship must still be able to fit through the opening. Bottles with minor distortions and soft tints are often chosen to hide the small details of the ship such as hinges on the masts. Alternatively, with specialized long-handled tools, it is possible to build the entire ship inside the bottle.
With the exception of a single Dutch example from the beginning of the 19th century, ships in bottles appear to date from after 1860. This may have been due to the introduction of mass-produced bottles with clearer glass.
Small objects that expand naturally
One variation of the impossible bottle takes advantage of pine cones opening as they dry out. In constructing the display, a closed, damp cone of suitable size is inserted into a narrow-mouthed bottle and then allowed to dry inside the bottle.
Fruits and vegetables inside bottles are grown by placing a bottle around the blossom or young fruit and securing it to the plant. The fruit then grows to full size inside the bottle. This technique is used to put pears into bottles of pear brandy.
Penny in a bottle
A US one-cent coin sealed inside a small bottle is a common souvenir. They are mass-produced using glassblowing techniques, by placing a coin inside a semi-molten glass cup, and then reshaping the open end into a narrow neck and mouth, completing the bottle. Non-metallic objects need to be protected from the hot glass to prevent scorching, for example with a fireproof cloth.
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