It's a 20th Century Jewish pictorial exegesis of Psalm 150, created to enhance Christian worship.
It's a startling and beautiful work in stained glass, one of my favourite things to look at. Baptist churches should have stained glass windows may be a minority view of one, but I struggle to see any valid objection to visual beauty as an aid to worship.
It's an interpretation of written text in image, form and colour. Along with music, such art provides an exegesis that is neither more nor less important than written commentary or spoken exposition.
It's a picture of exuberance. I don't mean it's an exuberant picture, but that it represents worship as praise, gratitude, wonder, noise, dancing, walking, climbing, arm-waving; it represents joy embodied and laughter in movement, the human spirit doing what it does best in response to the exuberance of God, the shared exuberance of Creator and creature, of imago dei answering to our Original.
It's a psalm in glass, and in colour, and looking at it is intended to create in the heart the words it depicts - exuberant praise of God.