Top Design with Filter FactoryWatching coordinates 
RemainderWith % (modulo) operator, that returns the surplus of division, we convert serial numbers into repetition of certain numbers. So, we can convert the result with scl() function into a repetition of gradients like the blind. To set the width of each strip, use the function ctl() that enables us to use slider controls. Filter Factory GUI has 8 slider controls in 4 pairs labeled "Map 0:" to "Map 3:", and each slider has the index 0 to 7, though not labeled. scl(x%ctl(0),0,ctl(0)1,0,255) 

DivisionHere, let's try to give index numbers (start with 0) to each strip of this blind. Then, we see these numbers are corresponding to the quotients. And more, with % operator and 2 as a divisor, we can get the repetition of 0 and 1. Wow! Multiplying the result by 255, there appears black and white stripes. Or we can use condition operator ?: , that is, I think, more versatile. ((x/ctl(0))%2)*255 or (x/ctl(0))%2?255:0 

Checker boardLet's apply the same idea again on checker board pattern. Adding the x index with y index, the result shows the checker of even numbers and odd numbers. And we can easily convert them into repetition of 0 and 1 with % operator. And then, there appeares a complete checker board. Of course, we can use top slider control to adjust the cell size. ((x/ctl(0)+y/ctl(0))%2)*255 