Improvisation work T R (I) A N G (L) E - collaboration with two friends (first and fourth letter: T and N, both tilted to the left).
Another friend could not participate due to illness. Hence, the letters I and L are missing.

Improvisation work - collaboration with three friends (cell-like forms in the first quarter, biomorphic form in the middle of the third quarter [s. upper half], all non-brush style forms in the last quarter & various structure-effects)

Improvisation work - collaboration with three friends (yellow and purple forms & most of the clouds)

Improvisation work - collaboration with two friends (yellow forms & highlights)

Improvisation work - collaboration with two friends (blue forms)

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