The picture of two trees represents the period of CREATION. God commands Adam not to eat from one of the trees, but Adam disobeys God, resulting in banishment from God's presence and death (Gen. 2-3). Since these two trees are at the very center of life in the garden, and since eating from one of them marks the entrance of sin into the world (Rom. 5), this picture is a reminder of these important events that take place in the period of CREATION.
The picture of a gift represents the period of ABRAHAM. In spite of Abraham's old age and Sarah's barrenness, Abraham believes that God is able to give him a son, as he has promised. God justifies Abraham, an ungodly person, on account of his faith (Gen. 15:6; Rom. 4). The picture of a gift underscores that justification is a gift of God by his grace.
The picture of the two stone tablets represents the period of SINAI. The Ten Commandments are the "stipulations" of the Mosaic covenant (Exod. 20; Deut. 5–6). God's people were required to keep these commandments; failure to keep them constituted "breaking" the covenant. The Ten Commandments serve as a reminder that the Law is given in this period and that it is central to God's covenant with Israel.
The picture of a blue crown represents the period of KINGS. Human beings are created in God's image to be his royal representatives (Gen. 1:26-28; Ps. 8). God's promise of kings to Abraham through Judah represents the continuation of the royal line, which will be realized through David's son whom God will raise up (Gen. 49:10; 1 Sam. 16; 2 Sam. 7).
The picture of a bird of prey represents the curses of the Mosaic covenant and the period of EXILE. God makes a covenant with Israel, promising to bless them if they obey his laws, but curse them if they disobey them (Lev. 26; Deut. 27—28). In 586 BC God's curses are poured out on Judah because they have disobeyed his laws (Jer. 7—11).
The picture of a temple represents the last period of the Old Testament known as TEMPLE. The picture recalls both the tabernacle (Exod. 25—40) and the temple built by Solomon in Jerusalem (1 Kgs. 6—8). The temple is destroyed in 586 BC by the Babylonians, but rebuilt after the exile in this final period, being completed in 516 BC (Ezra 6).