The Altar is a simple design in general shape but it's details carry a number of significant meanings. 
Isaiah 40: 22 says:
..."He sits enthroned above the circle of the earth...he stretches out the heavens like a canopy and speads them out like a tent to live in"  This verse is represented in many details.  The dark center circle in the altar represents sin on earth. The Star is light in color and is a sign that "pierces" the darkness of earth.
  The Altar is a "canopy" over the created earth. The canopy is supported by four curved legs.  The curved legs can be seen as God lowering Himself in the form of Christ who humbled Himself  in obedience. This act of Christ brought with it the Cross which is carried by the Star down to Earth
At the same time the top of the Altar is elevated from the four curved legs. The Altar is where the Sacrifice of Christ is celebrated in the form of bread and wine. The elevated top  represents Christ being raised and exalted.
Philippians 2:
"Who being in very nature God, he humbled himself and became obedient to death on a cross..
Philippians 2:
Therefore God exalted him to the highest place.."
At the top of the legs and at the corners of the top are eight medalions made of pointed maple strips set in a circle revealing a form of a star burst. These "points of light" represent the congregation and  believers in general.
Matthew 5: 14, 16
"You are the light of the world...let your light shine before men that they may see your good works and praise your Father in heaven"