> well, using ' λ' rather than lambda saves 5 chars ;) great! thanks. with the help of this and other nasty tricks i managed to make a simple animation: (grab(build-particles 99))(pdata-map!(λ(c)1)"c")(spawn-task(λ()(grab 2)(random-seed 1)(pdata-map!(λ(p)(vadd p(srndvec)))"p"))) best, gabor