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    <p>For plotting open or closed intervals you could do something like:</p> <pre><code>intPlot[ss_, {s_, e_}, ee_] := Graphics[{Red, Thickness[.01], Text[Style[ss, Large, Red, Bold], {s, 0}], Text[Style[ee, Large, Red, Bold], {e, 0}], Line[{{s, 0}, {e, 0}}]}, Axes -&gt; {True, False}, AxesStyle -&gt; Directive[Thin, Blue, 12], PlotRange -&gt; {{ s - .2 Abs@(s - e), e + .2 Abs@(s - e)}, {0, 0}}, AspectRatio -&gt; .1] intPlot["[", {3, 4}, ")"] </code></pre> <p><img src="https://i.stack.imgur.com/JB3FE.png" alt="enter image description here"></p> <p><strong>Edit</strong> </p> <p>Following is the nice extension done by @Simon, probably spoiled by me again trying to solve the overlapping intervals issue. </p> <pre><code>intPlot[ss_, {s_, e_}, ee_] := intPlot[{{ss, {s, e}, ee}}] intPlot[ints : {{_String, {_?NumericQ, _?NumericQ}, _String} ..}] := Module[{i = -1, c = ColorData[3, "ColorList"]}, With[ {min = Min[ints[[All, 2, 1]]], max = Max[ints[[All, 2, 2]]]}, Graphics[Table[ With[{ss = int[[1]], s = int[[2, 1]], e = int[[2, 2]], ee = int[[3]]}, {c[[++i + 1]], Thickness[.01], Text[Style[ss, Large, c[[i + 1]], Bold], {s, i}], Text[Style[ee, Large, c[[i + 1]], Bold], {e, i}], Line[{{s, i}, {e, i}}]}], {int, ints}], Axes -&gt; {True, False}, AxesStyle -&gt; Directive[Thin, Blue, 12], PlotRange -&gt; {{min - .2 Abs@(min - max), max + .2 Abs@(min - max)}, {0, ++i}}, AspectRatio -&gt; .2]]] (*Examples*) intPlot["[", {3, 4}, ")"] intPlot[{{"(", {1, 2}, ")"}, {"[", {1.5, 4}, ")"}, {"[", {2.5, 7}, ")"}, {"[", {1.5, 4}, ")"}}] </code></pre> <p><img src="https://i.stack.imgur.com/pvE1u.png" alt="enter image description here"></p>
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    1. CO+1, but do you mind if I edit the above to generalize for multiple intervals?
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    2. CO@Simon Overlapping intervals will spoil the plot. I think another visualization strategy is needed for that :(
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    3. COTrue. I only tested my modification of your code on non-overlapping intervals. You'd need to manually simplify/reduce first...
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