To coil or fold or cause to coil or fold

It's a matter of what verb is being referenced. I.E. am I doing the [verb] or am I doing something that makes the object [verb] ?

"To coil" is as if I am doing the coiling. Example: "I coil the spaghetti."

"To cause to coil", I am not doing the coiling, but somehow it still coils. Example: "I boil water and cause the spaghetti to coil."

The word "fold" can be used in two ways:

I fold the bed. (transitive)

The bed folds for storage. (intranitive)

Such verbs are sometimes called ergative. The dictionary definition suggests that "convolute" can also be used both transitively or intransitively (but it is a rare word as a verb, it's more common as an adjective "convoluted")