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Task/Draw-a-clock/J/draw-a-clock-1.j

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+Note'rudimentary 4 second clock'
+ advances an arrow at roughly 1 second intervals,
+ accurate to the nearest half second.
+ Please replace draw with a verb demonstrating one of
+ j's fantastic graphical capabilities.
+ x draw y
+ x are session seconds
+ y is the initial value, session seconds at tic start in the example
+   tic^:8 seconds''
+)
+
+delay=:6!:3    NB. "sleep"
+seconds=:6!:1  NB. session time in seconds
+Pass_y =: (]`[`)(`:6)  NB. adverb that evaluates the verb and returns y
+
+round =: [: <. 0.5&+   NB. round to nearest integer
+PICTURES=: u:16b2190+i.4 NB. whoot arrows
+draw=: [: smoutput PICTURES ((|~ #)~ { [) [: round -
+
+tic=: (>. draw Pass_y <.) ([: seconds 0 $ delay@1:)

Task/Draw-a-clock/J/draw-a-clock-2.j

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+require'plot'
+N=:0.01*i.629
+O=: [: j./ 1 2 o./ ]
+
+delay=:6!:3    NB. "sleep"
+clock=: [: plot (O N),N*/~0.07 0.11 0.15(*O) 2r24p1 2r60p1 2r60p1*_3{.6!:0 bind ''
+delay@1:@clock^:9e99''