That sudden switch from grey to orange with the patterning just fascinates me. I like calico and tortoiseshell genetics anyway, but the patch-work stripes tickles my eyes.
I have been learned, calico isnt necessary with white either,Irritates me when people mix up tortoiseshell and calico - two completely different colours lol.
Torties have zero white on them.
Obviously there are variants of both colours like the tabby-calico colour or a faded calico, even a black tortie.