The Impossible Layout is named such because it manages to fit in both a numpad and an inverted-T arrow cluster into the same layer as the alpha keys.
Main layout
The Impossible Layout places the middle column of the alphas onto where the punctuation keys were, moving he most used punctuation to be accessed by the thumbs. Because removing the middle columns fits with the Workman layout's philosopy, Workman is used as the basis for the layout. This means the layout should be very easy to learn for Workman users, and reasonable for Colemak users. Other space gains are made by combining keys that are only ever chorded with other non symbol keys (with function-layer alternatives where needed).
Alpha-numeric layer
Q
D
R
W
B
F
U
P
J
7
8
9
A
S
H
T
G
N
E
O
I
4
5
6
Z
X
M
C
V
L
Y
K
Up
1
2
3
Alt/Tab
Gui/Esc
,
CTL/Bsp
Fn/Ent
SFT/SPC
.
Left
Down
Right
0
Adj/Ent
Function layer
!
@
#
$
%
^
&
*
F12
F7
F8
F9
Tab
[
]
-
Del
'
(
)
F11
F4
F5
F6
Menu
=
\
/
PgUp
F1
F2
F3
Alt/Tab
Gui
~
CTL/Bsp
Fn/Ent
SFT/Spc
;
Home
PgDn
End
F10
Adj/Ent
Qwerty
The Qwerty layer, mostly intended for gaming use, makes use of the doubled chorded/non-symbolic keys to obtain use of the entire alpha-numeric typing area.
Qwerty layer
Gui/Esc
1
2
3
4
5
6
7
8
9
0
Bksp
Ctrl
Q
W
E
R
T
Y
U
I
O
P
/
Shift
A
S
D
F
G
H
J
K
L
;
"
Alt/Tab
Z
X
C
V
Fn/SPC
B
N
M
,
.
Adj/Ent
Qwerty Fn Layer
Gui
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
Ctrl
~
[
PgUp
]
-
Up
=
F12
Shift
Tab
Home
PgDn
End
Del
Left
Down
Right
Alt/Tab
Fn/Spc
Menu
Adj/Ent
Stenography
The Steno/Plover layer moves the number row below the regular keys, providing a much more comfortable placement for the thumb keys. Using this layout will require a slightly different dictionary to account for different keys being adjacent to the number row.
Steno Layer
S
T
P
H
*
F
P
L
T
D
S
K
W
R
*
R
B
G
S
Z
#
#
#
#
#
#
#
#
#
A
O
E
U
Adj/Ent
Adjustments and Options
In order to switch between layouts and change other keyboard settings, an adjustment layer is accessible from the same position over any layout.