Sea creatures that grow on land

Cacti are not indigenous to Africa but many South African succulent Euphorbia have similar forms to cacti and have a definite resemblance to sea creatures. I got this plant as a single rooted offset but these actually form clumps so in time, the pot will be full of little spiky stalks. Like cacti, some Euphorbia have swollen stems and spikes but they also have tiny little leaves at the tip of the stem.

Euphorbia mamillaris is normally green but this one is variegated, so I decided to turn it into a black and white image.

Variegated succulents are very popular but I find that the sun is too harsh outside and I have to grow variegates like these in shade otherwise they turn completely white, which just looks weird. That makes this species difficult to grow because Euphorbia like full sun and regular watering but the soil needs to dry out very quickly, otherwise they rot, and shade makes the soil dry out more slowly so this one also grows in a clay pot and I make sure to water it lightly.