Trivia
Various sizes, from large-scale to pocket-sized

The pipe organ at Concert Hall Shizuoka AOI has three manuals, a 2.5-octave pedalboard and 2,868 pipes, the scale one might expect of an instrument intended for use in a hall. While there are many more examples of such enormous instruments with great numbers of pipes, there are also smaller hand-held organs.
The biggest pipe organ in the world is the organ in the main auditorium of the Boardwalk Hall in Atlantic City, United States. It is so big that the number of pipes is not accurately known. Published documentation suggests there are 33,114 pipes, and it is said that there are at least 32,000. The organ at the Suntory Hall has around 6,000 pipes, which would make the Atlantic City organ 5.5 times that size.

Portative organs can be played while being held by hand, with wind generated using bellows in the left hand while the manual is played using the right hand. Even though they differ in size, both of them are pipe organs that produce sound by passing air through pipes.
The photograph shows a PO-103 small pipe organ ready for installation. There is one manual with 56 keys, and three timbres of wood and metal pipes that number 168 in total. With this model also, many of the pipes are positioned inside the instrument, and are not visible from the outside.