  We propose the concept of "LSDvis": the (highly exaggerated) visual blending
of situated visualisations and the real-world environment to produce data
representations that resemble hallucinations. Such hallucinatory visualisations
incorporate elements of the physical environment, twisting and morphing their
appearance such that they become part of the visualisation itself. We
demonstrate LSDvis in a ``proof of proof of concept'', where we use Stable
Diffusion to modify images of real environments with abstract data
visualisations as input. We conclude by discussing considerations of LSDvis. We
hope that our work promotes visualisation designs which deprioritise saliency
in favour of quirkiness and ambience.
