Not so much a lecture as a workshop, really.
Eventually the scholars pull the group all back together to conclude the class.
"Alright, now that you've had the chance to practise a bit, we're going to show you the kind of thing you can look forward to being able to do, if you apply yourself to your studies," the Time mage tells the group. He takes a step back and nods to the others.
Carefully, three of the other wielders incant their spells.
One brings into being deer-like creature made of earth pulled fom the trays left out for that purpose, onto which he tosses something which turns out to be grass seed, which he grows to resemble fur. Its antlers are made of sharp stone. The Life and Earth mana animating it gives it a semblance of life, and it wanders around pretending to sniff at the students.
Another calls up a wall of shimmering light, crawling across the floor and up the walls before seemingly melting them, leaving behind the appearance of a clearing in a forest. One can even hear the rustling of the leaves, the trickling of a distant stream, and smell the scent of soil after rain.
The last spell slowly pulls together a vast cloud to cover the ceiling of the room, which rumbles ominously before releasing a torrent of rain. The rain slides off a dome over the students and teachers, collecting in the troughs at the edges of the room. A few flashes of lightening crash off the dome as well - the netting dulls the noise.
The students ooh and aah, and the observers do as well, leaning forward to examine the effects. Several from each group reach out to examine them with unrefined mana, trying to learn how they were done.