Free standing balloon structure where groups of balloons are set directly on top of each other in various ways. There are many different shapes and patterns that the column could have, though the most widely known is the spiral pattern.
These are really elegant and elicit a “Wow” response- this refers to balloon columns that have a balloon on top (often a jumbo balloon) that has a light bulb inside of the top balloon. The light can be a soft light, all the way to a bright bulb with a 100 watt output. Your balloon professional will know which lights work best without getting too hot.