"What is is, what isn't isn't." ...  
This sumie (Japanese
word
for
black
ink
painting)
circle is derived from the Sanskrit
word
"sunyata". It
means
"emptiness"
or
"nothingness"
in
Zen
Buddhism.
It was created by Zen master and calligrapher Yamada Mumon Roshi. 

Postscript: Introduction To Binary Numbering 
Base 10 decimal  0  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 
Base 10 decimal  0  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 
Base 18 octal  0  1  2  3  4  5  6  7  10  11  12  13  14  15  16  17  20  21  22  23  24 
Base 10 decimal  0  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 
Base 16 hexadecimal  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  10  11  12  13  14 
Base 10 decimal  0  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 
Base 12 binary  0  1  10  11  100  101  110  111  1000  1001  1010  1011  1100  1101  1110  1111  10000  10001  10010  10011  10100 
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