Cactus / khoyo

This cactus is a grafted Astrophytum myriostigma v nudum cv red bean khoyo kikkow.
I lost several good mature plants in summer and so I grafted 9 seedlings after that to maintain the numbers.
This cultivar is green in summer but the body color is turned to red bean during autumn to spring as similar to autum foliage. Since it is just the beginning of autumn, the color is orange.