Lucyna Gaj
a new conception of piano performance
To play well, it is necessary to AD-JUST the keyboard to the hands

G.L.C.F. keyboards

Is the future of piano performance.
It is a replacement of the single-keyboard system with a multi-keyboard system.
It is a system of replaceable individual piano keyboards that improves playing both on upright pianos and on grand pianos.
Why it is necessary to modify the keyboard
The standard keyboard with which grand pianos and upright pianos are provided was adopted by the inventor of the grand piano - Bartolomeo Cristofori from the harpsichord more than 300 years ago. We do not know who invented it and when, but it is quite old, because it is around 1,000 years' old.

I think it should be modernised in such a way that it could be used by more players and could give pianists (whose hands deviate from the certain ideal size) relatively equal conditions of peformance of a difficult repertoire.

The current standard keyboard has 88 keys, i.e. 52 white keys with a width of 22.5 mm and 36 black keys with a width of 11 mm. Intervals between white keys are 1 mm. The keyboard used by Mozart for playing and composing had 61 keys, whereas Chopin played and composed on the 82-key keyboard. Recently the number of keys in some grand pianos has been enlarged to 97 for the purpose of performing contemporary music.
The keyboard is the part of a piano on which the pianist's hands perform incredible acrobatic exercises and hard physical work for many years, both during the education period and later during a professional career.

The standard keyboard appears to be universal, i.e. comfortable for all players… 
...unfortunately, appearances can be deceitful. 
This keyboard is ideal on the higher and top level of piano performance only for those who easily grasp (minimum) a tenth, i.e. 10 white keys. For those who grasp a 9th (9 white keys) the keyboard is slightly less ideal, and for those who grasp only an octave (8 white keys) it actually becomes an instrument of torture.
The standard keyboard is not universal by any means and, moreover, it ruthlessly eliminates all players whom it does not suit from playing on a higher level.

Standard keyboard

A comparison of my hand with a concertiser's hand on the standard piano keyboard with a white key width of 22.5 mm

G.L.C.F. keyboards

The prototype of the G.L.C.F -17 keyboard with a white key width of 17 mm. I grasp a tenth on this keyboard.

Example of playing on a G.L.C.F. keyboard

An example of playing on the prototype of the replaceable G.L.C.F.-17 keyboard with a white key width of 17 mm.