 
 <prompt> Wetin come dey shine for public eye? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Classical statistical mechanics need h to dey exist (but e no define im value). Finally, afta Planck discover, dem come realize say physical action no fit get any kain value wey e like. Instead, e must be some kind small amount wey be multiple of one very small quantity, wey dem dey call the "quantum of action", wey dem dey call the Planck constant now. Classical physics no fit explain dis fact. For many cases, like for monochromatic light or for atoms, dis quantum of action also mean say only certain energy levels dey allowed, and values wey dey in between dey forbidden. 