My columns are primarily not build to have a function. I'm playing with shapes and colours and build a 'sculpture' with them. But, with a bit of creativity a function can be added. In winter I will have them standing in dark corners with big candles on top of them. Some of them can be topped by glass to make a stand, HERE is a detail of how they are used in a eyewear shop. A friend who - over the years bought two of them - uses hers in this way and changes the decor according to the season. Others have fruit on it or have their businesscards lying in it.
The two latest Honderdwaters definitely do have a function; or not if one prefers just to look at them like they are.
The picture above is the first Honderdwater build as a table. The next one can be used in many different ways.