Dots & Rings visit - living art

On June 13 I visited the exhibition and found - again - the  colourful crochet rings had gone missing. I am really curious to know who likes (or hates) them so much that he/she gets a ladder to remove them. I do hope that the riddle will be resolved one day.

The other rings aged and weathered as expected but were also adopted by a cryptic sprayer. They now proudly sport some numbers and/or letters: As far as I can make out it is two 4s and a 1 or Z. Wikipedia offers you an explanation for 144 with regard to the year. §441 is a law of the BGB to negotiate a price and §414 another one. 44Z is a measure for the chain wheel on a bicycle and Z44 a dry gin. If you google 4Z4 you get all sorts of parts and a video for an off-road truck. 

 

 

On the other ring set I found J i K, if the J is meant to be a J. Wiki offers an explanation for IJK, but for any arrangement of the letters you will find multiple meanings.

So, explanations for the intended abbreviation are greatly appreciated. Do come forward, anonymous artist😀!