artists can paint 
with more than one white 
if they start off by mixing 
a tone called mid-grey 
half way between 
white high 
 and 
black low 
then 
mixing in half 
white high and mid-grey 
they keep on mixing 
one half at a time 
until small tones 
of paint that are just off-white 
not much different 
from 
 other off-whites 
are painted on a canvas 
of 
white  on  white 

.

artists can paint 
with  more than one black 
if they start off by  mixing 
a tone called mid-grey 
half way between  
black low 
and 
white high 
then 
mixing  in half 
black low and mid-grey 
they  keep on mixing 
one half at a time 
until small tones 
of paint that are just off-black 
not much different 
from 
other off-blacks 
are painted on a canvas 
of 
black  on  black 

.