I have never had trouble with any actor being able to visualise things. They are amazing. As long as you have your monster head on a long stick so you can hold it up there and you can wave it around and let them see it and explain it to them they are just great.
It is from the progeny of this parent cell that we all take our looks we still share genes around and the resemblance of the enzymes of grasses to those of whales is in fact a family resemblance.