import rhinoscriptsyntax as rs
import random as ran

allobjs = rs.AllObjects()
rs.DeleteObjects(allobjs)

bsize = 10
dist = 10
offs = bsize + dist
num = 10

corners = [(0,0,0), (bsize,0,0), (bsize,bsize,0), (0,bsize,0), (0,0,bsize), (bsize,0,bsize), (bsize,bsize,bsize), (0,bsize,bsize)]

rs.EnableRedraw(False)
for i in range(num):
    for j in range(num):
        for k in range(num):
            myran = ran.randint(0,5)
            if ((i%5) ) and ((j%5) ) and ((k<5) ):
                if (myran > 1):
                    box = rs.AddBox(corners)
                    rs.MoveObjects(box, (i*offs,j*offs,0))

            else:
                box = rs.AddBox(corners)
                rs.MoveObjects(box, (i*offs,j*offs,k*offs))
                rs.ObjectColor(box, (i*255/num,j*255/num,255))


rs.EnableRedraw(True)