Multifunctional furniture

[1] The functions combined vary, but a common variant is to incorporate an extra storage function into chair, tables, and so forth, making them so-called storage furniture.

[2] It more efficiently uses up living space.

[3] Lack of space can be an important reason for choosing such furniture, but combination furniture is also seen in larger homes for more space-efficient utilization.

[1] Historically, furniture with transforming mechanisms was called "mechanical furniture".

Some common examples of multifunctional furniture are:

A sofa bed unfolded from a couch into a bed