I bought this puzzle and decided to make a change on it.
This is the original piece. Colorful and distracted.
This is the inner part of the puzzle after the numerals are remove.
I am yet to decide whether to do any change to this or not.
Green color because the Sand Paper Number call for green.
With knobs make of board pin for pincer grip.
I certainly feel that the modified version is much eye soothing.