[jonah]

You just append new <figure> elements to the <main> in the example and it will automatically put them in the appropriate column.

[nitwit005]

Your answer doesn't appear to relate to what I asked. You need to know when to query the backend for more data if it's an infinite scrolling setup.

[jonah]

Aahh. The way you phrased your question was pretty ambiguous.

The other posters have good answers. One thing to consider for a smooth interaction would be to eagerly load the next x elements before they scroll into view.