Question: How many themes are depicted in the last supper and what are they?
About the article "Last Supper", section "Artistic depictions".

Candidate passages:
There are two major episodes or moments depicted in Last Supper scenes, each with specific variants.
There are also other, less frequently depicted scenes, such as the washing of the feet of the disciples. 
The Last Supper of Jesus and the Twelve Apostles has been a popular subject in Christian art, often as part of a cycle showing the "Life of Christ".
Depictions of the Last Supper in Christian art date back to early Christianity and can be seen in the Catacombs of Rome.
The Last Supper was depicted both in the Eastern and Western Churches.
By the Renaissance, it was a favorite subject in Italian art.
It was also one of the few subjects to be continued in Lutheran altarpieces for a few decades after the Protestant Reformation.
There are two major scenes shown in depictions of the Last Supper: the dramatic announcement of the betrayal of Jesus, and the institution of the Eucharist.
After the meal the further scenes of Jesus washing the feet of his apostles and the farewell of Jesus to his disciples are also sometimes depicted. 
The Last Supper has been a popular subject in Christian art.
Depictions of the Last Supper in Christian art date back to early Christianity and can be seen in the Catacombs of Rome.
Byzantine artists frequently focused on the Apostles receiving Communion, rather than the reclining figures having a meal.
By the Renaissance, the Last Supper was a favorite topic in Italian art.
There are three major themes in the depictions of the last supper.
The first theme is the dramatic and dynamic depiction of Jesus' announcement of his betrayal.
The second theme is the moment of the institution of the tradition of the Eucharist.
The depictions here are generally solemn and mystical.
The third major theme is the farewell of Jesus to his disciples, in which Judas Iscariot is no longer present, having left the supper.
The depictions here are generally melancholy, as Jesus prepares his disciples for his departure.
There are also other, less frequently depicted scenes, such as the washing of the feet of the disciples.
Well known examples include Leonardo da Vinci's depiction, which is considered the first work of High Renaissance art due to its high level of harmony, Tintoretto's depiction which is unusual in that it includes secondary characters carrying or taking the dishes from the table and Salvadore Dali's depiction combines the typical Christian themes with modern approaches of Surrealism.
Searching for themes and considering what works and what does not work within themes enables the researcher to begin the analysis of potential codes.
In this phase, it is important to begin by examining how codes combine to form over-reaching themes in the data.
At this point, researchers have a list of themes and begin to focus on broader patterns in the data, combining coded data with proposed themes.
Researchers also begin considering how relationships are formed between codes and themes and between different levels of existing themes.
It may be helpful to use visual models to sort codes into the potential themes.
Themes differ from codes in that themes are phrases or sentences that identifies what the data "means".
They describe an outcome of coding for analytic reflection.
Themes consist of ideas and descriptions within a culture that can be used to explain causal events, statements, and morals derived from the participants' stories.
In subsequent phases, it is important to narrow down the potential themes to provide an overreaching theme.
Thematic analysis allows for categories or themes to emerge from the data like the following: repeating ideas; indigenous terms, metaphors and analogies; shifts in topic; and similarities and differences of participants' linguistic expression.
It is important at this point to address not only what is present in data, but also what is missing from the data.
conclusion of this phase should yield many candidate themes collected throughout the data process.
It is crucial to avoid discarding themes even if they are initially insignificant as they may be important themes later in the analysis process. 
Biblical basis.
The Last Supper appears in all three Synoptic Gospels: Matthew, Mark, and Luke.
It also is found in the First Epistle to the Corinthians, which suggests how early Christians celebrated what Paul the Apostle called the Lord's Supper.