Adding 0.5 and 0.5 : ( it is white with a light tent of grey )
sutract 1 from 0.5 : ( white but able to see one side of the cube )
if clamped Adding 0.5 and 1 : ( A bit more darker grey able to see the cube little more )
multiplying 0.5 by 0.5 : ( light grey and semi visual on the subjected cube )
multiplying 0 by 1 : ( pure black )
divide 0.5 by 1 : ( light grey with no visual on the cube )
divide 0.5 by 0.5 : ( again light grey but with semi visual of the cube