Word Grid
Every room in the grid has 2 images that appear as portraits in the room, they depend on the coordinates of the room, and consist of 2 images that each indicates a word in English, with 1 word having an extra character to the other, that character is then recorded in that grid location, and the complete grid exposes a message。
The grid goes from A to E from left to right, and from rank 1 to 9.
The workshops indicates the correct letter in stone.

A1
image Dessert and Desert: S
B1
image 1 image 2 Pray and Pry: A
C1
image Ace and Face: F
D1
image Pine and Pin: E
E1
image Stag and Tag: S
A2
image Plane and Plan: E
B2
image Stairs and Stars: I
C2
image Bridge and Bride: G
D2
image Bath and Bat: H
A3
image Crow and Row: C
B3
image Tier and Tie: R
D3
image Clock and Lock: C
E3
image Peak and Pea: K
A4
image Card and Car: D
C4
image Stage and Sage: T
D4
image Fire and Fir: E
E4
image Sand and And: S
B5
image Pilot and Plot: I
C5
image Tiger and Tier: G
D5
image Chart and Cart: H
E5
image Tent and Ten: T
A6
image Grain and Rain: G
B6
image Coast and Cost: A
C6
image Planet and Plane: T
D6
image Stage and Stag: E
E6
image Coast and Coat:S
B7
image 1 image 2 Tie and Time:M
C7
image Paint and Pint: A
D7
image Flan and Fan: L
E7
image Plane and Pane: L
A8
C8
D8
image Crown and Crow:N
E8
image Plan and Plant: T
A9
image Chief and Chef: I
B9
D9
image Grain Wheat, fire, match, flame, heat Wheat and Heat: W
