You will not find advertising opportunities like this in print, and many other digital publishing platforms do not offer it either. Along with the responsive abilities of the PageRaft content, this represents a fairly unique sponsorship opportunity.
The images can display two at a time, either with vertical spots to the left and/or right of the content, or with horizontal spots above and below. When a screen width allows, the vertical spots to the left and right become available, while the horizontal spots appear when screens are narrower (portrait orientation).
This is similar to semi-dynamic image template, that will display content within a single raft of your publication, but off to the periphery of the viewing area. Unlike other sponsorship opportunities, however, this one can be set to display for the entire reading experience, if desired. You can also set peripheral sponsorships to appear along with individual rafts, as seen in this example.