Hello, I'm looking for two videos I watched as a child in the '80s:

One was a sci-fi/fantasy movie about a teenager magically transported to another world as a dragon. He is live-action as a teenager and animated as a dragon. I thought the title was 'the Flight of the Dragons' but that just brings up something else.

The other is a small film I could only find at the library: it's all about sandcatles that, clay-a-mation style, build themselves into complex shapes and cities.

If anyone has any leads, I'd appreciate it.