A towering cumulus is actually just another congestus or calvus cloud. Here, however, I try to show what the real effect of a towering cumulus is. A cloud growing straight up with few or no clouds around it. Hence, it looks like a tower.

This towering cumulus is given a soft pinkish light in the sunrise.

This towering cumulus appeared one evening in the West African sky. The sun is just behind the cloud shortly before sunset.