Two items with scroll wheel select, water falls and round transparent disk, have no other items in the selection.
What is the transparent disk that casts shadows and reflects light? Photo one
Some instructions would be welcome.

Water falls can be rotated but not scaled during placement.
The transparent disk can be scaled but not rotated during placement.
Clouds are 2D, double sided photos and Right Clicking the cloud icon does not delete the clouds.

The front page gallery tour is impressive.