beside

;;; (beside i1 i2 ... in [description]) -> image?
;;;   i1 : image?
;;;   i2 : image?
;;;   ...
;;;   in : image?
;;    description : string?
;;; Create an image with `i1` through `in` placed beside each other
;;; in a row.

> (define c1 (solid-circle 20 "red"))
> (define c2 (solid-circle 30 "purple"))
> (define c3 (solid-circle 40 "blue"))
> (beside c1 c2 c3
          "three circles in increasing size next to each other, with their centers aligned")

> (beside c1 c1 c1 c1
          "four small red circles in a row")

> (beside c1 c3 c1 c3 c1 c3 c1
          "seven alternating small red and medium blue circles in  row")