This image is based upon the Matins/Orthros gospel reading of the day; where the vineyard owner's son is killed. Holy Monday is more commonly known as representing the day of the cursing of the Fig tree, but I saved that image for later. The image of the gospel reading presented an image in my mind which I had to depict.
The reading is Matthew 21:18-43, though the section which provided the image specifically is 33-40:
"Listen to another parable. There was a landowner who planted a vineyard and put a wall around it and dug a wine press in it, and built a tower, and rented it out to ]vine-growers and went on a journey. When the harvest time approached, he sent his slaves to the vine-growers to receive his produce. The vine-growers took his slaves and beat one, and killed another, and stoned a third. Again he sent another group of slaves larger than the first; and they did the same thing to them. But afterward he sent his son to them, saying, 'They will respect my son.' But when the vine-growers saw the son, they said among themselves, 'This is the heir; come, let us kill him and seize his inheritance.' They took him, and threw him out of the vineyard and killed him. Therefore when the owner of the vineyard comes, what will he do to those vine-growers?" They said to Him, "He will bring those wretches to a wretched end, and will rent out the vineyard to other vine-growers who will pay him the proceeds at the proper seasons."
Blood and grapes are here on the mosaic floor, after the death of the landowner's son; a hint of the sacrifice to come on Holy Friday.