…because the picture is the illustrated version of the sentence “VAKÁCIÓ!”, the obligate, usually colourful and imaginatively designed text on the blackboards of the Hungarian elementary schools before the long Summer vacation (zoom). The animated SVG version of the picture shows how the text is longer day by day, started with the exclamation mark.
Interestingly, the coloured chalk was invented 200 years ago, according to the resources of Wikipedia (see blackboard): James Pillans Scottish classical scholar and educational reformer created it from ground chalk, dyes and porridge in 1814 for teaching geography.