Please see pictures
Much of the variegation in our popular houseplants is virus induced. It’s a desirable trait, for the most part, and adds great value to an otherwise ordinary plant. Mosaic virus is a very common cause of leaf variegation. How can you not know that, Mike, as interested in unusual plants as you are. The virus is introduced purposefully and the variegated plant is perpetuated by asexual propagation in mass quantities.