One of my favourite capabilities in Drupal is the facility to create a changing cycle of images, with fades or other transitions between photographs. This can be done in various ways and I usually like to use the add-on 'Views Slideshow Cycle' module which comes as part of 'Views Slideshow'.
The really clever stuff is done by open-source Javascript libraries, but the task of integrating these with Views and its helpful User Interface is done by a fairly complex 'contributed module', and this I have just ported for use within Backdrop.
Here is a demonstration of what it can do:
