  Artificial Intelligence Generated Content (AIGC) has shown remarkable
progress in generating realistic images. However, in this paper, we take a step
"backward" and address AIGC for the most rudimentary visual modality of human
sketches. Our objective is on the creative nature of sketches, and that
creative sketching should take the form of an interactive process. We further
enable text to drive the sketch ideation process, allowing creativity to be
freely defined, while simultaneously tackling the challenge of "I can't
sketch". We present a method to generate controlled sketches using a
text-conditioned diffusion model trained on pixel representations of images.
Our proposed approach, referred to as SketchDreamer, integrates a
differentiable rasteriser of Bezier curves that optimises an initial input to
distil abstract semantic knowledge from a pretrained diffusion model. We
utilise Score Distillation Sampling to learn a sketch that aligns with a given
caption, which importantly enable both text and sketch to interact with the
ideation process. Our objective is to empower non-professional users to create
sketches and, through a series of optimisation processes, transform a narrative
into a storyboard by expanding the text prompt while making minor adjustments
to the sketch input. Through this work, we hope to aspire the way we create
visual content, democratise the creative process, and inspire further research
in enhancing human creativity in AIGC. The code is available at
\url{https://github.com/WinKawaks/SketchDreamer}.
